Some adjustable difficulty would have been nice. I myself have actually never completed all the levels, Devler (my partner for the jam) did, but I didn't xD
Thinking back to it, we probably could have thought of a sort of speed up slow down mechanic and/or extra difficulty change in settings ourselves, especially considering how many people pointed it out. But in the end we oversaw it.
Thank you very much for the feedback! We will try to improve everything that was said the next time we compete in a jam!
But most importantly: Thank you very much for playing and having fun while doing so :D