The visuals were really nice and the music fit well with the game! The overall concept and the implementation of the idea worked very well and perfectly fit the theme, and created some nice exploration elements like new jump height unlocking areas that are initially close to spawn which made for some nice Metroidvania/Soulsborne level design too!
I think maybe the countdown bar and the hearts could have been merged gameplay wise so that taking damage just lowers the countdown, this would mean the player only has to track one stat instead of two: maybe only by a small amount so jumping off of enemies is still a feasible strategy.
Overall, the game was very well polished and was a very unique interpretation of the theme (which it also matched flawlessly), amazing game!