Unknown
Very enjoyable game, though I got a bit annoyed when I had the weapon type I wanted because my ship was big and the enemies would fill the screen I found that they'd create a wall of weapon powerups that I had to fly through so I'd be swapped to a less favourite weapon despite not picking up a negative effect. Can someone tell me how to get unknown? I found every other powerup myself but I've not got a clue what to do for this last one.