The atmosphere was nice, would have benefitted from some tense/action music tho. But I felt a bit lost with the gameplay, it felt like I was controlling a truck rather than a mouse and I had trouble avoiding the boss attacks (I would have expected attacking the boss to stop it mid-dive since my own character's mobility is so low). I also had a bit of trouble picking up the rocks because of the everchanging camera, as well as their small size. A way to get new rocks once you've thrown all those you have and the boss isn't dead would be nice. Finally, the way the healthbar worked wasn't super clear, and I also think the splash screen at the start of each fight is a really cool feature but should be much faster.
The art in itself isn't anything special but the artstyle works wonders, and the sound fx were great. (I may sound negative in my feedback but overall I just think a faster+easier to control character would make this game into a great one).