Massteroids is a game I've been working on sporadically for quite a while now. It's essentially a combination of Asteroids and Kerbal Space Program. You can watch the video to get a good idea of how it's played.
I made it using Unity and C#. The most important system is probably the trajectory calculation. Each frame, all objects will compute a fixed number of positions in the future, and their actual positions will advance by 1 through the list. That way I can draw all of the future positions in the form of a trajectory, but I can also keep performance costs down by only calculating a fixed number each step.
