Some really ancient X11 games. These were originally written in break times at work when I had a Sun workstation.
I've updated the code so it's not quite so K&R and added timers so they don't just run ludicrously fast on modern servers.
Dash is a boulder dash clone which rather pointlessly also has a Curses mode so you can play it in a text terminal.
Galax is a simple left/right and shoot shoot 'em up. This was written before I'd heard the term bullet hell, but it is a rank bad example of one.
Lunar is a simple vector graphics lunar lander game.