Awesome visuals and Art, very polished and reminded me of NES Kirby a lot.
Had some issue with the pogo off bats and the spikes section (the jump had to be too precise and sometimes the bats hit you even if you land on top of them), maybe lift the ceiling a little so it feels less cramped or adding some coyote time?
Loved the last section with the anticipation before the boss too
Great work! :D