Rayman Jungle Run is a 2D platformer that costs $2.99 and has in app purchases.
Pro Varied gameplay
Excellently paced, the game introduces different mechanics as the game progresses so it doesn't feel stale. To change things up even more, there are challenge levels that turn the default focus of collecting as many of Lums as possible to pure survival. Add to that responsive controls and you have a fun, addictive game.