A 3D take on Space Invaders, this game has them approaching you head on, while you shoot them. It's only kind of pseudo-3D, the invaders themselves are flat, and your projectiles are polygons. Arrow keys move your targeting, and space fires.

The perspective makes the game harder, as you fire slowly and it's hard to gauge how distant the enemies are (it's game over if any reach you.) The game written in C with the Master.LIB library (used for several other doujin 3D games), and the source code is on the disk.