Fun game, I really liked the graphics, especially portal animations. *SPOILER* Was "There is no end" the end of the game? If so it fits the jam if not please tell me I would love to complete the game.
Some things that stood out most for me
*Ball jumping mechanic
*Upbeat music with a longer loop (Felt like a proper BG music, I played it the whole time I was writing this review)
*Portal animations (ya you said that)
I always avoid having SPACE as jumping key because I feel it is a bit unreliable because of it's size, I tend to miss many jumps. W or Up arrow key are near and have a good control over them, but hey that's just my opinion.