That slice animation is so juicy, holy hell this is good. Super short of course, but wow is it good.
There is tons of stuff you could do with this concept, moving enemies, boss battles where the weak points help you reach other platforms, or maybe even enemies that give you a one time powerup, like a double-jump.
Easy to learn. Fun to play. Not really hard to master (but that's because the game is short and not fleshed out).
I totally see this going in an awesome direction.