Your game control felt really good! The movement while jumping and the movement speed are well adjusted. I found the pacing of the game kind of off, like you can just run on tiles that are only 1 by 1 and there is no sign of which tile is the next to fall, probably making your game hard to balance. A good solution for that and the pacing, would be to give to the player an insight of which one would fall for a short period (like 1 or 2 second before they do) but in exchange making that 2, 3 or 4 can go at the same time. found myself stuck at the 4th level 2 or 3 times, waiting a long time the sphere with no immediate danger to keep me entertained. Your concept is really awesome too, I enjoyed it a lot :)