After struggling with the speed of OpenTK I worked on only a couple other projects before finally moving on. These were the last things I ever made in OpenTK
I wanted to try my hand at method for "Triangle Soup" vs. sphere collision detection. I got to the point where I had divided the levels triangles into a quad tree and tested moving the sphere around and seeing which triangles it would have to do intersection tests with
I also worked on a 2D snake game for a demonstration. It was a simple snake game with a couple more features not shown here. It had a grid that moved like Geometry wars and bombs that would spawn that you would have to dodge. It was a fun game to show people and mess with the settings (speed, spawn-rate, etc.)