That was great, I loved how the player makes their own difficulty. If you kill three approaching enemies quickly, you have to do three jumps in quick succession. But if you take your time you can make a wave incredibly easy. I liked how I slowly recognized the roots and the tree from the art pack, great job with the art!
I can just echo what others have said: a wave indication or some other method of showing it's not an endless game in the first wave would be nice.