Very interesting use of the theme ! The situation really does get out of control.
I would say though making bunny spawn faster at the beginning. I also think it is lacking of content. I get done with the game after some tries. Maybe adding some grow time once the baby bunnies spawn ? Enriching the gameplay ?
It looks like I didn't saw any quit button, am I missing it ? if there isn't any it would be nice to add it or a "back to menu" one.
Interesting game overall. I like the art !