[+ / -] / [Mouse Wheel] / [Mobile Pinch] to change draw dot size

[Ctrl-Z] to Undo

[Ctrl-Y] or [Ctrl-Shift-Z] to Redo

[Delete] to get rid of the current drawing

[Backtick] to clear the Undo/Redo edit history

[F] to toggle Fullscreen

Once you reach 0 ink, your oldest ink will start to disappear (this means that Undoing won't be able to bring it back, sorry).

I had much bigger plans for this that would have made it more of an actual game instead of just a drawing program . . . unfortunately I ran out of time.