In the past I started a simple 2d jump'n'run game for android devices where you have to collect coins.
I started this just for fun and for learning purposes. Its quite simple to add new level, because of a xml-based map-design.
It has some physic effects and simple animations, but I never finished this, because I'm not very good at graphics design and i had to do a lot of other work.
Its not a 3d temple run, but tonight im looking for the sources.