Very interesting. One or two clipping issues, code-wise, but well-done in an engineering aspect. In terms of actual gameplay or design, it has some good ideas... except that the interaction of mouse events and the keyboard was a bit unpredictable. I found that if the mouse was not centered exactly on the crosshairs, my perspective would... wander. Very annoying in that aspect. If the control was smoother, it'd be a lot more fun. But overall, a great effort.
