First and foremost take this comment with grainsss of salt,
i like the game concept of exchange, its quite fun but i feel like the game could have some checkpoints if it were to be quite difficult like this. and i personally don't have a tool/ability to help defend myself other than the dash maybe the dash could have some iframe to it too?
for me, 2nd boss is way too fast without other ways to defend myself like a heal maybe? im not sure.
i also feel like the music could have extra spice in it i feel like its kinda monotone?
on the otherhand, game's visual cues is good. boss attacks is very visible. art is cute. controls is good