Yeah, I suppose the one strategy I foresee occurring would be for the player to let 3 bunnies immediately fall into the water, then have two bunnies to manage. To counter this, I have the bunny's speed multiply by 1.1 every 4 seconds. So after 2 minutes of a bunny staying alive, it's moving extremely fast. The most I've been able to play before dying was around 2 minutes and 30 seconds, which I think is the right amount of time for a game like this.