I love this game, it may lack the attack/defend options but with a fully upgraded base and artilery cannons on every slot fireing simotainiously, who needs that?
PS you might want to send every ship you have too.
GameGuru, i had the same problem, you have to change your streategy, put strongholds on both sides and a warp gate in the middle, work your way to earn the warpgate that how you beat level 5
the decreasing score thing makes it chalangeing, but i think that there should be something to increace score, like spending x amount of resources to increace score.