This game is actually so hype.
Took a few tries but grinded my way to the boss just because you mentioned it's a secret haha - and it was worth the surprise
The physics of the bubble bullets is unique and fits in well with the game's theme! In terms of "Limited," I think it's executed well since bullet hells are usually a spray & pray feeling, whereas this felt like I had to be precise if I wanted to survive til the next blue bullets became available.
Great mix of challenge, feeling like your getting more skilled after each runthrough, and implementation of assets (good ol parallax). Fish hell heaven