Unfortunately, I think there is some kind of bug concerning edges of objects. I got stuck twice in corners of the first pit next to the trampoline, and once on the edge of the first jumpable block. I think it just puts the player in infinite fall, making them unable to move.
One other time I got stuck was, when a ball hit the player, and they just didn't get up anymore.
As there is no quick restart button, I really didn't feel like continuing after getting stuck the 4th time.