Nice art, but I found it difficult enough with the keys changing. So, I would have preferred it if the guy stays in the lane he's in instead of randomly bouncing when you don't hold down a key.
You're right, I didn't have much time to balance it and I think it ended up getting more difficult than it should. I almost implemented your suggestion but I ended up going with this one to stay more in line with the Jam theme. Thanks for the feedback.