The ice physics aint it, in my opinion. Game feels very floaty, which made dodging very frustrating, i experienced a glitch during the fire boss where i couldn't return inside the play space anymore, after respawnign i couldn't fire, had to reset the game entirely. Only made it maybe halfway through the wall boss, i don't know what was hitting me but it was hitting me for an 8th of my life at a time in very quick succession.
The concept here is interesting tho! and i can't say i didn't have fun beating the fire boss, your music is rad and your art style is simple but effective!