The concept of beating levels by flinging yourself and your enemies around using a gun and bullets with ridiculous knockback seems fun. The implementation could use a bit more work though.
The first level was practically unplayable, as has been mentioned in another comment. The others were comparatively fine, though there were some sections where I apparently randomly died and got returned to the start.
I like where you were trying to go with this game. Good job on your first game jam submission!