Really nice old-school game! Very fun bullet hell bosses, altough for some, after a while, the attack pattern becomes a bit repetitive (mainly for the second boss). The game controls are smooth and precise, very much needed for a game in the genre! The music is very catchy, and the art is great! The bosses look really cool, even more in their more mutated forms!
I have some nitpicks for the game, tho (mainly visual):
- The first background is cool, but a bit too busy, and enemies and projectiles easily blend in and they are a bit difficoult to see.
- The plane enemies don't have a shadow, unlike other flying enemies
- The boss animation is a bit too fast and doesn't really give you time to "feel your victory"
I hope these could be useful if you want to add more to this game! :D