Yooooooo this is really cool for your first jam! You did the juice very well, maybe some knockback on enemies would be nice but that'd be 100% up to you. Also, more invincibility frames after getting hit would be nice, especially since I was at full health pretty much until I touched an enemy and immediately died.
The art and music is clearly amateurish, but I liked it a lot and you did it really well for your skill level, I can definitely see you improving on it if you keep working at it!