Great little game. Graphics are really well done, and the music bops along nicely. If in between levels you could choose a power up to increase your weapon damage, or give a shield, etc, it would add so much to the motivation to continue playing. As it stands I got to the third level and died, and didn't really want to play all the way back to that spot. A continue as well as a retry would be nice, and I know it stops people playing it the whole way through, but considering it's a jam game people usually don't have too long to play them.
Really polished good game though, congrats on getting it done in the time, with all those trimmings.