I've always been a big fan of 1-bit artsyles with a splash of colour, really helps emphasize particular parts of the level. This game uses that really well!
The main mechanic is great and the puzzles are cool, only nitpick is I think it could've used some extra time between freezing in one life and respawning in the next though, I kept walking off a ledge because I didn't react quick enough to being in the new life