The only nitpick I have is that the rabbit area is kind of anticlimactic. Since the game was really easy all the way through I was hoping for a place to challenge me a bit more, you know. You get a new movement upgrade prior to it, but you really get no opportunity to use it.
since you are considering that, a small nitpick i have is that unlike the leaves which you can see how many are left with the minimap, you can't figure out how many rabbits you need to fully moss.
because there are 32 leaves, i assumed the number of rabbits would be a power of 2 as well, so i ended up looking throught the whole map for a 16th rabbit, before i attempted to fully moss just in case.
i would either add a new rabbit so it's a power of 2, or add a progress indicator, maybe the number of rabbits could turn gold or something upon getting them all.