Okay, first of all this is a really interesting concept. I love the art style in general, the ground tiles, the background and the animations (the front grass covers a lot of them though)! The music is beautiful too! The only thing that i don't like is that the cooldown bars (especially for the jump) are taking too long for no particular reason.. Also, you didn't "close" the left side of the game and you can easily fall til' infinity, but this is minor. Overall, the main idea of usefull deaths is great and i hope you will dig more into that! Great job!