I liked this idea a lot! The little touches--the clicky sound the robot runner makes, the background art--are very nice. It wasn't clear to me why I got a game over (Main Menu/Restart) screen a couple times on Endless mode without being stuck or falling into the fire; it might have to do with the battery/coin pickups, as what they signified or affected also wasn't clear to me. Good use of save points to keep the game from being too repetitive. One thing I found interesting about this game concept is that it really is possible to lock yourself out of success, because if you explode/steam too early on a pipe you're not going to be able to avoid that since there's no way to close up airholes... Overall, a very neat twist on the endless runner genre, and excellent use of the limitation and the theme!