Cool game man, as other says, the camera makes a bit difficult and suggest to keep it still and move it on certain tiles or events (ex. captain toad as an example or super mario land 3d on the 3d stages), also I would like to use the two axis of the control to control each one at the same time, it can speed up the gameplay; or join both spheres to create a bigger and faster one that breaks on collision or with a button, but it is harder to stop. Nevertheless it is a good game, keep it up.