Rocket Commander is a free game programmed in C#. You are a rocket and need to get through an asteroid field to your target.
There is a Mods Page on the site that will allow you to download Flower Commander which turns the asteroids into none lethal Sunflowers. Plus there is a preview of a space ship mod called Coop Commander which is a mod that adds deeper missions and ships that you an pilot.
The thing about this game is that it is running on the .Net Framework, which C++ programmers would have you believe makes all applications run with appallingly awful performance issues. They consider the facts that it doesn't crash when it launches a miracle and that there is nothing better than an application written in C++. They are wrong of-course and this is the future.