I like dark and minimalistic tone. Music and sounds fit very well.
I couldn't figure out what to do, though :( But good job either way!

It is a bit difficult to understand at first what you're supposed to do. On top of that there was a lot on screen at once and I was not sure which rocks were hitting me and which were on the background.

Also, the red and green bar were a bit confusing, may be you could replace the red bar by a currency that is ticking up. Furthermore, the green meter fills up like half way before I even saw the character I was supposed to hit.

I think it also need some balancing, I just spammed the space bar and won most of the time.

The thing I like about most about your game is that the monster design was pretty epic! I love playing as a cool monster.

Extremely unclear what I’m supposed to do. My bullets disappear before they even hit the dude and the flying things just get stuck in my face. Good art though.