First off, I have to give praise for the game containing no forced ads. I played for about ten minutes, going through multiple levels, and hadn't encountered a single ad. The concept, having to change sizes while in motion to pass obstacles, is an interesting take on a runner.
However, my praises for this game honestly end there. You can change your character's size from super skinny to so large that they roll, and anything in between; however, the dominant strategy for each level becomes to alternate between the largest and the smallest form, not even bothering with the inbetween sizes. Plus, the game is inexplicably broken up into levels, after each of which you gain coins that hold absolutely no significance aside from an arbitrary score.
If I were to improve this game, I'd do away with the coins, make the different sizes matter more (for example, obstacles that you need to destroy with a larger form but you can't just go full ball) and make this game the infinite runner that it so clearly wants to be. In its current state, it's not terrible, but far from amazing.