Hyperfocal Designs' Unknown Orbit gives you control of a comet orbiting a series of small planets. The aim is to time your landings on each planet's surface, holding one finger on the touchscreen as you rocket down a mountain slope, and letting go as you launch from any available incline.
I hadn't heard about this title until now. Sounds quite intriguing. Might give it a go.
I wonder how much work, relatively, has to go into these kinds of games. Simple premise, still lots of fun, but perhaps not too challenging to code. Sounds like a win-win-win.