Okay played the game again - still wasn't able to finish. I think it was the last level but after repeating it over 20 times I got a bit frustrated :D The game at it's core is incredibly fun, it was so much joy to run around, jump as that little ball, cool stuff. But there's also a lot of little annoyances which could be very easily fixed - lack of checkpoints, jump noise(making just 3 different instead of 1 + random chance of not making any noise at all would make it way better), very basic level design(I imagine that's because lack of time but maybe instead of extending the same level you could just make some kind of "open world" level with start middle point and few paths in different directions having to collect disc at the end of each path - that would be less repetitive and the game would feel more complete). 

It's really a neat idea with some more polish it would probably jump straight into my top 1 of this game jam(maybe that's just my love for platforming games... : ). Cool game! :D