The core concept of time = health is really good but it took me a while to figure out that that was the mechanic. Maybe a tiny bit of tutorialisation or even a splash page with some story reason why Mr. Pivot here has seconds to live and can get time back by killing enemies.
This game's hard as ballz!
I like the character movement and their moveset, very cool. There's a special place in hell for those mug enemies. Having to fight stationary cubes is not the most stimulating, but I like the cubes that shoot at you and give you a fraction of a second to get out the way.