Did you mean to be relatively evil by making the jump so high the spikes aren't visible until you come back down? :)
I like the super simple art style and the music, but couldn't get very far (you have to go easy on us old farts!!).
After the jam is over I'd love to see you implement a lot of the feedback here.
p.s. this coming weekend I'll be rolling coal (for real) in my steam locomotive -- coal ain't all bad!