diff --git a/src/nostalgia/modules/gfx/src/gfx-gba.cpp b/src/nostalgia/modules/gfx/src/gfx-gba.cpp
index 169933d3..d264c024 100644
--- a/src/nostalgia/modules/gfx/src/gfx-gba.cpp
+++ b/src/nostalgia/modules/gfx/src/gfx-gba.cpp
@@ -350,7 +350,7 @@ void panic(const char *file, int line, const char *panicMsg, ox::Error const&err
 	const auto heapEnd = reinterpret_cast<char*>(MEM_EWRAM_BEGIN + heapSz);
 	ox::heapmgr::initHeap(heapBegin, heapEnd);
 	OX_ALLOW_UNSAFE_BUFFERS_END
-		auto tctx = turbine::init(keel::loadRomFs("").unwrap(), "Nostalgia").unwrap();
+	auto tctx = turbine::init(keel::loadRomFs("").unwrap(), "Nostalgia").unwrap();
 	auto ctx = init(*tctx).unwrap();
 	std::ignore = initGfx();
 	std::ignore = initConsole(*ctx);
diff --git a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp
index 5f4f99ad..7ff98b84 100644
--- a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp
+++ b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp
@@ -126,7 +126,7 @@ void TileSheetEditorModel::paste() {
 	auto const pt1 = m_selection->a;
 	auto const pt2 = ox::Point{s.columns * TileWidth, s.rows * TileHeight};
 	if (auto const cmd = ox::makeCatch<CutPasteCommand>(
-		CommandId::Paste, m_img, m_activeSubsSheetIdx, pt1, pt2, *cb); cmd.ok()) {
+		CommandId::Paste, m_img, m_activeSubsSheetIdx, pt1, pt2, *cb); cmd.value) {
 		std::ignore = pushCommand(cmd.value);
 	}
 }
@@ -202,38 +202,38 @@ void TileSheetEditorModel::endDrawCommand() noexcept {
 	}
 }
 
-void TileSheetEditorModel::addSubsheet(TileSheet::SubSheetIdx const&parentIdx) noexcept {
+void TileSheetEditorModel::addSubsheet(TileSheet::SubSheetIdx const &parentIdx) noexcept {
 	std::ignore = pushCommand(ox::make<AddSubSheetCommand>(m_img, parentIdx));
 }
 
-void TileSheetEditorModel::rmSubsheet(TileSheet::SubSheetIdx const&idx) noexcept {
+void TileSheetEditorModel::rmSubsheet(TileSheet::SubSheetIdx const &idx) noexcept {
 	std::ignore = pushCommand(ox::make<RmSubSheetCommand>(m_img, idx));
 }
 
 void TileSheetEditorModel::insertTiles(
-	TileSheet::SubSheetIdx const&idx, std::size_t const tileIdx, std::size_t const tileCnt) noexcept {
+	TileSheet::SubSheetIdx const &idx, std::size_t const tileIdx, std::size_t const tileCnt) noexcept {
 	std::ignore = pushCommand(ox::make<InsertTilesCommand>(m_img, idx, tileIdx, tileCnt));
 }
 
 void TileSheetEditorModel::deleteTiles(
-	TileSheet::SubSheetIdx const&idx, std::size_t const tileIdx, std::size_t const tileCnt) noexcept {
+	TileSheet::SubSheetIdx const &idx, std::size_t const tileIdx, std::size_t const tileCnt) noexcept {
 	std::ignore = pushCommand(ox::make<DeleteTilesCommand>(m_img, idx, tileIdx, tileCnt));
 }
 
 ox::Error TileSheetEditorModel::updateSubsheet(
-	TileSheet::SubSheetIdx const&idx, ox::StringViewCR name, int const cols, int const rows) noexcept {
+	TileSheet::SubSheetIdx const &idx, ox::StringViewCR name, int const cols, int const rows) noexcept {
 	OX_REQUIRE(cmd, ox::makeCatch<UpdateSubSheetCommand>(m_img, idx, name, cols, rows));
 	std::ignore = pushCommand(cmd);
 	return {};
 }
 
-void TileSheetEditorModel::setActiveSubsheet(TileSheet::SubSheetIdx const&idx) noexcept {
+void TileSheetEditorModel::setActiveSubsheet(TileSheet::SubSheetIdx const &idx) noexcept {
 	m_activeSubsSheetIdx = idx;
 	this->activeSubsheetChanged.emit(m_activeSubsSheetIdx);
 	clearSelection();
 }
 
-void TileSheetEditorModel::fill(ox::Point const&pt, int const palIdx) noexcept {
+void TileSheetEditorModel::fill(ox::Point const &pt, uint8_t const palIdx) noexcept {
 	auto const&activeSubSheet = getSubSheet(m_img, m_activeSubsSheetIdx);
 	// build idx list
 	if (pt.x >= activeSubSheet.columns * TileWidth || pt.y >= activeSubSheet.rows * TileHeight) {
@@ -280,7 +280,7 @@ ox::Error TileSheetEditorModel::rotateRight() noexcept {
 		m_img, m_activeSubsSheetIdx, pt1, pt2, RotateCommand::Direction::Right));
 }
 
-void TileSheetEditorModel::setSelection(studio::Selection const&sel) noexcept {
+void TileSheetEditorModel::setSelection(studio::Selection const &sel) noexcept {
 	auto const &ss = activeSubSheet();
 	if (sel.a.x < ss.columns * TileWidth && sel.a.y < ss.rows * TileHeight) {
 		m_selection.emplace(sel);
@@ -291,7 +291,7 @@ void TileSheetEditorModel::setSelection(studio::Selection const&sel) noexcept {
 	m_updated = true;
 }
 
-void TileSheetEditorModel::select(ox::Point const&pt) noexcept {
+void TileSheetEditorModel::select(ox::Point const &pt) noexcept {
 	if (m_selTracker.updateCursorPoint(pt)) {
 		setSelection(m_selTracker.selection());
 	}
@@ -318,7 +318,7 @@ bool TileSheetEditorModel::updated() const noexcept {
 	return m_updated;
 }
 
-ox::Error TileSheetEditorModel::markUpdatedCmdId(studio::UndoCommand const*cmd) noexcept {
+ox::Error TileSheetEditorModel::markUpdatedCmdId(studio::UndoCommand const *cmd) noexcept {
 	m_updated = true;
 	auto const cmdId = cmd->commandId();
 	if (static_cast<CommandId>(cmdId) == CommandId::PaletteChange) {
@@ -394,9 +394,9 @@ ox::Error TileSheetEditorModel::moveSubSheet(TileSheet::SubSheetIdx src, TileShe
 
 void TileSheetEditorModel::getFillPixels(
 		TileSheet::SubSheet const&activeSubSheet,
-		ox::Span<bool> pixels,
-		ox::Point const&pt,
-		int const oldColor) const noexcept {
+		ox::Span<bool> const pixels,
+		ox::Point const &pt,
+		uint8_t const oldColor) noexcept {
 	auto const idx = ptToIdx(pt, activeSubSheet.columns);
 	auto const relIdx = idx % PixelsPerTile;
 	if (pixels[relIdx] || activeSubSheet.pixels[idx] != oldColor) {
diff --git a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.hpp b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.hpp
index 4f6945da..fae64016 100644
--- a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.hpp
+++ b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.hpp
@@ -14,7 +14,7 @@
 
 namespace nostalgia::gfx {
 
-class TileSheetEditorModel: public ox::SignalHandler {
+class TileSheetEditorModel final: public ox::SignalHandler {
 
 	public:
 		ox::Signal<ox::Error(const TileSheet::SubSheetIdx&)> activeSubsheetChanged;
@@ -53,13 +53,13 @@ class TileSheetEditorModel: public ox::SignalHandler {
 		bool acceptsClipboardPayload() const noexcept;
 
 		[[nodiscard]]
-		constexpr TileSheet const&img() const noexcept;
+		constexpr TileSheet const &img() const noexcept;
 
 		[[nodiscard]]
 		constexpr TileSheet &img() noexcept;
 
 		[[nodiscard]]
-		constexpr Palette const&pal() const noexcept;
+		constexpr Palette const &pal() const noexcept;
 
 		[[nodiscard]]
 		ox::String const &palPath() const & noexcept;
@@ -71,26 +71,26 @@ class TileSheetEditorModel: public ox::SignalHandler {
 		[[nodiscard]]
 		size_t palettePage() const noexcept;
 
-		void drawCommand(ox::Point const&pt, std::size_t palIdx) noexcept;
+		void drawCommand(ox::Point const &pt, std::size_t palIdx) noexcept;
 
-		void drawLineCommand(ox::Point const&pt, std::size_t palIdx) noexcept;
+		void drawLineCommand(ox::Point const &pt, std::size_t palIdx) noexcept;
 
 		void endDrawCommand() noexcept;
 
-		void addSubsheet(TileSheet::SubSheetIdx const&parentIdx) noexcept;
+		void addSubsheet(TileSheet::SubSheetIdx const &parentIdx) noexcept;
 
-		void rmSubsheet(TileSheet::SubSheetIdx const&idx) noexcept;
+		void rmSubsheet(TileSheet::SubSheetIdx const &idx) noexcept;
 
-		void insertTiles(TileSheet::SubSheetIdx const&idx, std::size_t tileIdx, std::size_t tileCnt) noexcept;
+		void insertTiles(TileSheet::SubSheetIdx const &idx, std::size_t tileIdx, std::size_t tileCnt) noexcept;
 
-		void deleteTiles(TileSheet::SubSheetIdx const&idx, std::size_t tileIdx, std::size_t tileCnt) noexcept;
+		void deleteTiles(TileSheet::SubSheetIdx const &idx, std::size_t tileIdx, std::size_t tileCnt) noexcept;
 
-		ox::Error updateSubsheet(TileSheet::SubSheetIdx const&idx, ox::StringView const&name, int cols, int rows) noexcept;
+		ox::Error updateSubsheet(TileSheet::SubSheetIdx const &idx, ox::StringView const &name, int cols, int rows) noexcept;
 
-		void setActiveSubsheet(TileSheet::SubSheetIdx const&) noexcept;
+		void setActiveSubsheet(TileSheet::SubSheetIdx const &) noexcept;
 
 		[[nodiscard]]
-		TileSheet::SubSheet const&activeSubSheet() const noexcept {
+		TileSheet::SubSheet const &activeSubSheet() const noexcept {
 			return getSubSheet(m_img, m_activeSubsSheetIdx);
 		}
 
@@ -100,19 +100,19 @@ class TileSheetEditorModel: public ox::SignalHandler {
 		}
 
 		[[nodiscard]]
-		constexpr TileSheet::SubSheetIdx const&activeSubSheetIdx() const noexcept {
+		constexpr TileSheet::SubSheetIdx const &activeSubSheetIdx() const noexcept {
 			return m_activeSubsSheetIdx;
 		}
 
-		void fill(ox::Point const&pt, int palIdx) noexcept;
+		void fill(ox::Point const &pt, uint8_t palIdx) noexcept;
 
 		ox::Error rotateLeft() noexcept;
 
 		ox::Error rotateRight() noexcept;
 
-		void setSelection(studio::Selection const&sel) noexcept;
+		void setSelection(studio::Selection const &sel) noexcept;
 
-		void select(ox::Point const&pt) noexcept;
+		void select(ox::Point const &pt) noexcept;
 
 		void completeSelection() noexcept;
 
@@ -121,7 +121,7 @@ class TileSheetEditorModel: public ox::SignalHandler {
 		[[nodiscard]]
 		bool updated() const noexcept;
 
-		ox::Error markUpdatedCmdId(studio::UndoCommand const*cmd) noexcept;
+		ox::Error markUpdatedCmdId(studio::UndoCommand const *cmd) noexcept;
 
 		ox::Error markUpdated() noexcept;
 
@@ -144,21 +144,21 @@ class TileSheetEditorModel: public ox::SignalHandler {
 		ox::Error moveSubSheet(TileSheet::SubSheetIdx src, TileSheet::SubSheetIdx dst) noexcept;
 
 	private:
-		void getFillPixels(
-			TileSheet::SubSheet const&activeSubSheet,
+		static void getFillPixels(
+			TileSheet::SubSheet const &activeSubSheet,
 			ox::Span<bool> pixels,
-			ox::Point const&pt,
-			int oldColor) const noexcept;
+			ox::Point const &pt,
+			uint8_t oldColor) noexcept;
 
 		void setPalPath() noexcept;
 
 		ox::Error pushCommand(studio::UndoCommand *cmd) noexcept;
 
-		ox::Error handleFileRename(ox::StringViewCR, ox::StringViewCR newPath, ox::UUID const&id) noexcept;
+		ox::Error handleFileRename(ox::StringViewCR, ox::StringViewCR newPath, ox::UUID const &id) noexcept;
 
 };
 
-constexpr TileSheet const&TileSheetEditorModel::img() const noexcept {
+constexpr TileSheet const &TileSheetEditorModel::img() const noexcept {
 	return m_img;
 }
 
@@ -166,7 +166,7 @@ constexpr TileSheet &TileSheetEditorModel::img() noexcept {
 	return m_img;
 }
 
-constexpr Palette const&TileSheetEditorModel::pal() const noexcept {
+constexpr Palette const &TileSheetEditorModel::pal() const noexcept {
 	if (m_pal) {
 		return *m_pal;
 	}
diff --git a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditorview.cpp b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditorview.cpp
index 6e555e65..1190db3a 100644
--- a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditorview.cpp
+++ b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditorview.cpp
@@ -89,7 +89,7 @@ void TileSheetEditorView::clickSelect(ox::Vec2 const&paneSize, ox::Vec2 const&cl
 
 void TileSheetEditorView::clickFill(ox::Vec2 const&paneSize, ox::Vec2 const&clickPos) noexcept {
 	auto const pt = clickPoint(paneSize, clickPos);
-	m_model.fill(pt, static_cast<int>(m_palIdx));
+	m_model.fill(pt, static_cast<uint8_t>(m_palIdx));
 }
 
 void TileSheetEditorView::releaseMouseButton(TileSheetTool tool) noexcept {