Do NOT use this on an actual calculator unless you don't mind resetting it.
This is still totally broken, and I'm only releasing it here so that those of you without the toolchain can try it yourself.
I am not responsible for damage to your calculator due to bugs or for damage to your eyes due to graphics.
Obviously nothing is final here. This binary also contains the level pack, which will be separate in the final release.
The delete key skips to the next level.