Save Team Cherry... Autumnsaki Spawnchigo...!
Sadly I don't like HK and this game is so much of it that it's not for me too. For me the game design where bosses barely have openings to be attacked and the 300 frames freezes whenever you're hit is the enemy of fun, so seeing even those be replicated tells me the world really loves it and I'm the black sheep.
Game and game design aside, I think your aesthetic is better than the original, so I can appreciate your art and spritework, even if not the game.
Used traveler mode to see and judge your bosses properly (great feature more people with impossible games should have this). I think you started with the best one, the mushroom was the most interesting one, followed by the pig. The worm and the flower seemed like hell to fight seriously, and the final boss actually I expected a bit more of flair and the moveset wasn't very interesting.
I must say, you sure love falling rocks/objects, huh? Everyone drops something on your head in this game. I think the worm feels the worse (even as traveler) because it is immune for so long as the only move it does is the hit both edges of the screen until it gives you a small window to be hit. No parry to make you engage with the attacking enemies, and randomly all your attacks miss because of the wheel does kinda feel like a nightmare mode hard game enjoyers dream of, so one could say it is an upgrade from HK not just in aesthetic.