Nice concept overall. Though there is room for improvement. When I first began to play your game, I didn't know what to do exactly, so the tutorial needs to be more clearer. Some sprites are not properly layered. The feedback when getting hit from enemies was good, but could be improved to, e.g. by adding a screen shake. I also feel like the controls should be changed, instead of having to use arrow keys, it would've been much better to use WASD keys for moving MIZ. Other than that, good job!