Needs moar challenge!
This game was a great way to kill time, but I didn't feel that even the last level of the campaign was hard. I'm adding you to my favourite programmers list, in case you make the next one with more campaign levels that get even harder.
As far as the game goes, it looks pretty polished, but there was this weird glitch near the beginning of the last level where my survivors started running amok for a bit. I was like AAAAH, WHERE THE HELL ARE YOU GOING!? But then they settled down. So it wasn't too bad.
5/5