Nice implementation of the jam focus. It took me a few tries to figure out how to get across gaps, but I got there.
Unfortunately, this is marred by imperfect collision relative to where the lines appear to be. On a number of occasions, I found myself "falling" even though I was a good distance from the edge.
More sound effects would help with immersion, as would music. If you can't get a composer to collaborate with, there are free music assets available (generally requiring only attribution).