maybe add a "survival mode" just keeps going - enemis spawning, see how long you can last for.
Also, with the gun type arm on the last boss i expected to see a ranged attack from him.
Game is a little short - but i still enjoyed it
i got the same problem as dracmonster.
Just filled my store with minerals - dont have enough of the other resources to upgrade, so now my station has shut down with no way to get other resources....
 "Wrath Of Zombies"){kind=icon}
 "Trucking Zombies"){kind=icon}
 "Asteroid Mining Station"){kind=icon}
 "Into Space 2"){kind=icon}