Bacto Bros.

Welcome back in the lab! Get a friend and play each as a bacterium that lives inside the liquid of its friend's color.  Because of the fluids, one bacterium can walk on the ground, while the other can float around freely. With the press of a button you can give the other one your ability or revert that change to solve some platforming puzzles.

Isn't it a revelation to play as a pair of bacteria for once?