I really enjoyed playing this game! I appreciated your effort with the title screen and instructions which made everything clear. A suggestion for improvement would be to add in some more music and make the world a bit brighter when fighting the enemies. Then, once a boss spawns, cue the music and turn the brightness down exactly like how you have it now. Also, if you could find a way to incorporate the theme a little more than just background music, that would be ideal. Overall, I didn't find any major bugs, and I thought you made a fun game, great job!