It's a very interesting game! It was very difficult to get a sense of how far I would go - even if I tried to line up my jumps with the words on the ground, I missed my jumps like half the time. But, that's part of the challenge, I suppose!
The one thing that really frustrated me was that when you hit another ball while running on a ball, you instantly lose. I understand you don't want players to cheese the game by moving really close to the targets, but it didn't really make sense intuitively (I didn't fail my jump after all), and took away what would have been a fun aspect of the physics system.