So... The idea of the game is that you have to build a turret to defend yourself from the spaceships. You can put up to 6 weapons on it but The more you have, the worse each one is.

You can rotate the turret with 'O' and 'P' And to shot you use

'Q' 'W' 'A' 'S' 'Z' 'X'

They are referent to the positions of the turret, so 'S' always shoots the weapon on the right for example.