I think the screenshot says all you'll need to know about this exclusively 2-player game, because that's the only game screen there is here. Either player can move up and down or shoot MZX built-in bullets at the other player.

If one player gets destroyed, their robot explodes and the game doesn't even reset--you have to exit and restart when it tells you "Red wins!" or "Blue wins!"

No music, no sound..

It's not very good. I doubt anyone ever managed to get enough people together to actually play this thing either.