That was fun! The art is superb. The mechanics are highly competent, and the bosses had good designs to them. The music is also pretty cool.
I accidentally broke the game by dying as Chip-Chimp was defeated, which caused them to not appear again. I walked out of the room and ended up back on the first ship. Strange glitch.
The sound effects seem a bit louder than the music.
All-in-all, great work!