Loving this game. Some constructive criticism: Dialogue for powerup pickups in the upper right is out of view, can't read them. Also, in the second and third mission, it's not much fun to try and find the last enemy in the mazes. Perhaps consider some sort of despawn/respawn mechanic to move stray enemies closer to the player at the end of waves. Apart from that this game is really cool. It's got the 90's shooter vibe written all over it. :-D