We're going for a physics-based game this time. The idea is you have to build energy efficient robots, and prove their efficiency by navigating various test courses with a limited power supply. So far it's going pretty well, you can add rockets, boosters and magnets. It's also possible to navigate through the level, although generally what happens is you leave a trail of destruction. Trying to decide whether to reward players for breaking stuff, or not breaking stuff... hmm