This is an incredibly good game, but the alien campaign is rife with fake difficulty; poor ally AI is not difficulty. It's just annoying. It even breaks verisimilitude; the commanders in the last level seem much better when you're playing humans than when you're playing as aliens.
Fairly well done, but speed pretty much doesn't matter (if you really want to go first, get it up to about 15 including items), and the defense stat is crazysauce. Bonus points for cuteness of EVERYTHING and all the references and jokes in the descriptions, but the game is too slow-paced and too easy.
There's a slight bug in the game: you can't get the "no reloads" emblem if you run out of ammo. You do not have to reload for it to disqualify you. Still, not that major as the early missions can be very easy to complete without reloading.