Really nice retro-metroidvania! Feels like a classic Castlevania game in particular. Great spritework and fitting SFX and music. The gameplay was very solid, though a bit hard! I was surprised that the checkpoint didn't remember any of the pickups I had collected (beyond the chicken power anyway). I'm not sure if those are necessary or optional collectibles. I had a lot of trouble with the spike rooms... those were tough!
I encountered a possible bug... after beating the chicken boss, there was no music in the game, just SFX.
Excellent work!