yea might want to improve the path finding of the ships like others have said.. Ships will go completely counter clockwise around a planet to get to a building that was originally under them
very challenging, but, i don't like how in mid level more paths open for the enemies to spawn from. Not because this makes the game too hard, but if you happen to have a tower there (which I usally have towers near the beggining) It will be erased.
I love how if you look at first comments it's all about how good the game is then as soon as it gets a card everyone hates it... Great game nice and simple.
 "Master of Fortresses"){kind=icon}
 "Anti-Idle: The Game"){kind=icon}
 "Eridani"){kind=icon}
 "My Pet Protector"){kind=icon}
 "A Small Favor"){kind=icon}
 "The Eternal Battle"){kind=icon}
 "Microbe Kombat"){kind=icon}
 "Elite Forces:Conquest"){kind=icon}
 "SHIFT 2"){kind=icon}
 "Grid16"){kind=icon}
 "Epsilon"){kind=icon}
 "Kongai Launch"){kind=icon}
 "Arcane"){kind=icon}
 "FWG Cyborg"){kind=icon}
 "Breach"){kind=icon}
 "Fold"){kind=icon}