This is the CubicDoom, all the cubes have rebelled against
humankind! You need to stop the invasion!

Use Left Ctrl to turn to left, use Left Alt to turn to right.
Press Left Shift to advance, and Right Shift to shoot.

Destroy all cubes on the current maze to advance to the
next one. Careful! The cubes will advance towards you.

Enjoy it!

Download at https://github.com/nanochess/cubicDoom