Gaaah! They were bouncing for no reason! That really messed my plans up. Could be improved, but its still a great concept. And that no level select thing really killed me. I was on the 11th level and i accidently clicked main menu. That needs to be fixed.
I found that building tons of economic units (mostly housing) helps alot. If you can expand faster than the enemy, that is, upgrade to the next stage, your good. However, it is difficult to do this when your trying to repair all your houses and walls, especially when air units are involved.
I found that to beat 2.6 you need to take a more ship based strategy. Getting your spaceport upgraded to frigates actually helped a lot. Then get a few defenses. The firgates will do most of the work. Get another spaceport and then save up for the biggest ship you can buy.
An excellent addition to this game would be multiplayer. That would be awesome. And some sort of skirmish mode, where you can choose between the three races presented in the game, and maybe some other ones. Or at least be able to pick your color, lol.
I... Hate... 2.5! Everything else was easy until 2.5. I've tried it so many times I had to RAGE QUIT!!! I never rage quit. It was a first. But the game is great anyway, I just have trouble with this one level.