That was cute! The characters are charming, the mechanics are competent, and the bosses are fun and fair. I appreciate that shooting holds the character's direction. I had a lot of fun beating this one!
The game's art does a great job invoking the simple graphical style used in a lot of Game Boy games. That said, I think the overt use of in-between squash, stretch, and rotation effects detracts from the graphical cohesion and GameBoy-ness.
All-in-all, good work! Congratulations on the submission!