This a doujin tribute/upgrade to one of the first 3D / wireframe games, Battlezone
You use the arrow keys to turn/move your tank, space to fire, and shift to rotate the turret. Rotating the turret is certainly a new gimmick, but kind of hard to use practically. Enemies come in three types, and spawn from the HQ building (the one with a diamond over it.) Destroying all the HQ buildings is the goal of each mission. After destroying all of them, you need to dock with your transport craft, before going on to the next mission. You can also take various forms of damage, which reduce tank efficiency, like fire rate and turning.