I never made it past the 3rd level, so I haven't seen anything past that. The flesh system is interesting, but I didn't know how it worked with the explanation given until messing around with it myself and seeing how the bar filled (I originally thought the blue ones were health). The movement is very janky, I feel like the levels were sized too small and the character too big for them to work properly. There was also very strange hit detection at times, especially how landing on the bottom spikes does 1 hit of damage and then removes your ability to jump entirely.
Graphics and audio were very good (though lacking on sfx, the game could benefit from some way of letting the player know they got hit), I really liked the vibe of the game, definitely fits the theme well, I think if you fixed the movement this game would be really fun!