Hey, why not download the newest version? It has mouse support now. work_dbg.exe is windowed mode, debug build. Mouse does not always reacquire properly if you Alt+Tab. work.exe is fullscreen, release build. Alt+F4 to exit still.

Happy keys:
S - Stats, framerate and resolution.
W - Wireframe display.
E - Reset ball to paddle.
L - Camera roll.
Up Arrow - Move camera up.
Down Arrow - Move camera down.
Left / Right - Paddle movement.

Have fun. Source is out of date, so dont bother with it if you are looking for some code for any new features.