Alright, I know you all thought I was dead.
Well... I was, but I finally dusted off my calculator today and got some optimizations done.
Check the first post for some slightly updated info and a demo download.
Contains 8 test levels (none of the ones from the screenshot are included, but gameplay is basically the same), is much faster than before (mainly keypress reaction time), and is a bit smaller.
Oh, and the in-game tutorial is in there.
...
Also, read the freakin' README.
So... enjoy?