Overheat is a hard sidescrolling platformer in which a robot only needs to climb up one level to return to its home planet. How hard can that be?
There may be a few minor obstacles on the way up:

and maybe some less nice fellows:

But that shouldn't be too much of a problem, right?
Oh, did we mention that the robot is not allowed to stop?
No? Well, if the robot stops for a short time, it will OVERHEAT, explode and spawn at the beginning!
How many robots will you need?