A thing i think you should fix/just add because
Anyway I like your game. really nice. and i try to play with arrowkeys/Wasd to fly my ship and i cant help but getting annoyed that W makes you tilt down. So an "invert" option wound be really helpfull for thoose that dont like piloting with inverted controls and such.
Stage 9 Screwed me over, first i kind of just took the symbols themselves. then i registered the things on the left, but the first time i got it right by just looking at the symbols calculating them like Dizes
 "Astrox"){kind=icon}
 "BioMex"){kind=icon}