Fun game but, the tutorial needs to tell you a lot more. I had no idea why the other colonists started shooting at my colonists or that you could destroy their station by clicking on it. Please allow us to rotate the buildings too. It would be nice to be able to upgrade all of the buildings so you don't have to keep building more of each one. Oh and the guy that talks at the beginning of the missions is VERY ANNOYING! He's not funny at all...
Not bad, but not great. There's potential there. For v. 2.0 I would suggest adding targeting priority like Bloons TD. I also don't really get the difference between the the XP upgrades. Maybe some splash damage for the Cannons?
There is an important secret missing on the very first level! There should be a switch on the right pillar in the room with the steps that lowers the wall to the courtyard.