To be honest there's not a whole lot for me to say here. Everything I experienced in the game seemed to work just fine, but none of it was particularly compelling. The lack of audio made for a fairly flat experience, even just a bgm track would have made a huge difference. The platforming itself felt alright, but I honestly only went through one character as I found myself drifting mentally while looking for the last coins (I think, I couldn't tell without a coin counter).
As far as a game jam game goes, it's not bad at all. Just seems like you might want to scope your ideas down a bit in the future and concentrate on getting just a single mechanic looking, feeling, and sounding solid before expanding. I got the feeling a bunch of the map was drawn before mechanics were quite working, and then the ideas those mechanics were based off of were abandoned as the deadline approached (I assume the chests were supposed to open, etc). The nature of game jams is to abandon ideas as the deadline rears its head, but you really want to nail that one mechanic down, make it feel juicy, and then build out from there to keep people playing.
All said, you finished the jam with a playable little platformer, and gave us all a little game to enjoy. Thanks for making us a game!