Really nice, simplistic racing game! I liked the overall style of the game, has a bit of retro look to it maybe. I also liked the selection of very different balls, although it seems to be just for looks. The gameplay works really well, especially with the variable-speed moving blocks, even though the rival balls seemed to run into the distance after the start. The ball could also roll forward to improve the visuals even more.
I'd like to invite your game to this year's Game Development World Championship!