i played as the king - i just kinda alternated between spamming pawns defensively towards the lanes where the enemy had presence, and saving enough for a rook (both as a counter to the enemy rook if there is one, and as a way to render that lane essentially safe for some time). with an occasional cheeky fire-and-forget bishop thrown in (they actually seemed to deal most damage to the enemy queen)
i couldn't quite figure out how to use knights successfully :D