The game is pretty fun! I really like upgrading between the rounds :) Good job on the visual design, seems like you put in a lot of effort in making rabbit animations, it sure looks gorgeous!
If you want to improve on the game, I feel like the audio could do with a little love, such as making the rabbit death sound slightly less intrusive, and adding more "gamey" sound effects when you're firing, hitting rabbits and upgrading - just to make the audio even more juicy and satisfying :)
note that the game's audio is really good! but I just think there's a few things you can do to make it even better :) cheers!