Cool game with a nice neon art style! Also the tutorial was nicely implemented, and the instructions were very clear.
I feel like the small enemies are a bit too aggressive and numerous and the bosses spend a lot of their time off-screen because their patterns spread out there and are easier to dodge. Maybe you could have reduced the number of smaller enemies, and added some sort of shrinking wall to force the player to fight their way closer and closer to the boss?
Overall, I quite enjoyed the game, with some tuning it could be even more fun 🙂.