Nice game, I really liked concept. I think it would be nice to add a little clarity about where to go. I like that there is no linear direction, but some accents are needed, here to go first, here then, here - a secret zone, etc. Also, jumping spikes are a little annoying at first because you cannot predict their movement, but when you destroy them, almost the entire challenge is lost, which is also not very good.
In any case, this is a very high quality game and one of the best implementations of the jam theme.