Run Roo Run HD is a platformer game where you, a kangaroo, must avoid obstacles by jumping, swinging, riding clouds, and launching from cannons. Each level is a single screen, not scrolling.
This is a great little game, but the main levels are not very challenging. It took me less than an hour to complete the main levels in all 20 chapters. The extreme levels, however, are very difficult - some even too difficult, in my opinion. Even though I didn't feel particularly challenged, I enjoyed playing the game - I was able to casually play while watching an episode of Battlestar Galactica!