I really really like the idea of the game. Also you really nailed the Hotline Miami style and feeling, both in terms of visuals and music! I'm impressed you made all this in two days.
But I feel that the gameplay has a fundamental issue. The abilities are awesome to use, but it's extremely unapologetic. I died of overusing abilities more than from actual enemies, making the player themself a huge enemy. It's an interesting mechanic, but I'd either increase the base health or make the health penalty smaller. Also considering you can only kill enemies from behind when having full hp, the level design doesn't account much to it, as there's not enough dark to properly stealth around.
On the brighter side of gameplay I really liked the enemy design, it was creative and intuitive. It was clear which enemies could do what, and therefore change the strategy in approaching them. The samurai guys tho are a little overpowered haha.
Cool submission!