This is barely a prototype, cause it's already such a complete game. I'm happy with the game as it is, so I can't imagine how much better it'll be at full release!
I love the simplicity of the game loop, while still keeping it challenging and enjoyable. The artistic direction throughout the entire game is super solid. And I love how your enemies dance on your corpse immediately after you die, 9/10, maybe 10, it's really good.