Great work! Keyboard wise, it works really well. I found the onboarding panel persisting there the whole time kind of annoying. I wanted to dismiss it but could only minimise it. It sort of forces you to go through every feature upfront, rather than progressively disclosing features to you.

Nitpicks, but some of the ways in which it doesn't behave like a mac app I don't like. I don't like the non-native looking font. The sidebar isn't collapsible or resizable like a mac app, but I guess you could add an editor-style shortcut to toggle that. If you have a mouse plugged in you get scroll bars everywhere. It seems to maintain its own undo/redo stack? The shortcuts for undo/redo work but the menu commands for them won't.

Edit: typos