Space Kart Racing [Android][Free][2.3+] is a challenging physics-based space racer. Has a sandbox-like Garage to customize/reconfigure your ship, with real physically modeled results. (tip: set up your ship so that it steers the way you want to drive - fe: prefer drifting, or not? try sliding the engines forward or back.)

https://play.google.com/store/apps/details?id=org.davebollinger.spacekartracing