I've uploaded a new version.
- Adds IJKL movement, as requested by some left-handed users.
- Lets you switch between fullscreen/windowed (although the window is still tiny at the moment).
- Main menu now shows all the buttons/commands (such as +/- for adjusting volume) which were previously undocumented.
- Fixes the remaining scenarios where you could jump out of Granita Island.
Working on at least having some basic controller support.