This was really nice! And very impressive for such a short time, I loved the unique bosses the cute story and the art all around. This was great but I have some tips:
- A health system with health pickups would really help since losing points isn't really that big of a deal when you are invincible so the game doesn't really have stakes
- Some audio like the main music only came out of one headphone, so that's probably a wrong setting somewhere
-Normal levels could be trimmed since the bosses are considerably better so the actual levels feel a little slow and boring.
- A little hit indicator such as making the enemy sprite flash white and maybe some screen shake would go a loong way making you feel more powerful and making the game more fun.
These are just tips because the game is great already! If you want to spend some more time with it to make it even better I think some of my tips will help. Hope you can check my game as well :D