Good I got it. I just sent all my ships away at wave 22 so it would finish. how i did it, If i remember right: first two rounds cruisers. then controller and repair thing. then upgrade damage to max while repairing between waves. then armor to max while repairing. At some point i got a 3rd cruiser. then i upgraded thust as well, for the points. then just keep repairing between waves and build cruisers now and then.
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