So I'm not sure if you uploaded the wrong version or if when I extracted it something funky happened, but this seemed a little unfinished compared to your screenshots. There was no sound, no UI, and basically no information on what was happening. When I finished the level (I think I did, I hit the black line structure at the end), a picture popped up that I couldn't quite make out and then it restarted to the beginning of the level. I also initially couldn't figure out how to restart a level after I died, although after some button mashing I figured it out. Overall the experience is quite lacking, and it could have done with more polish. I did like the look of it, reminded me of Sonic and Mario, but it was also a little blurry. You mentioned you finished it in 3 days, but the game jam lasted for 16. I think using that extra time to sharpen up the game would have been good. Well done for submitting something though!