I must run, recently updated with gamecenter is now free for a limited time.
I must run is a side scroller in which your aim is to escape a from the prison in which you were placed in for your wifes murder. Even though you were innocent you just had to escape!
This game is similar to monster dash ($1.19). If you like this then I would reccomend you buy monster dash by Halfbrick.
Be quick, before the sale ends.