I'm not sure if I understood the concept of the game, but there are some tips that might be useful. Your character seems a bit stiff and to avoid it, you could simply replace rectangle shape with circle. Trail is really nice and with circle it would also look fuller.
There could be a bit more of a guiding, like making us see where to go next and making next platforms visible earlier. Because of this I had problems with playing as I was constantly dying while jumping on platforms I couldn't see.
Game jams are pretty tough to make a finished projects in time, so it's understandable that there are things to work on, tho It's a good submission ;)