I like the idea, but in my opinion it's a bit too hard in the beginning. Also, I think the "jump" sound should be more reminiscent of a gun. I kind of expected a loud bang when I played for the first time.
Might be preference though.
I really liked the main menu and the enviroment though! The graphics and animations were quite nice. I also loved the little reload animation the bunny does! It is a bit hard to spot though, but it's a nice detail.
All in all, if you continue working on this game you should try to make the area in the beginning a bit easier, and maybe change a few of the sound effects.