Well I finally moved to Mozilla for a few minutes to play this game, and as I suspected, it's awesome. Still, with no Chrome playability, I can't give it 5/5, so 4/5, because no chrome no 5.
Like everyone else I really enjoyed the story, and the game as a whole. However, I have to agree with others that the gameplay itself is kind of stale and boring, if it weren't for the story being as good as it was, this would be a boring, run of the mill shooter.
@Okmera: You have to meteor him hardcore. Upgrade your meteor damage, mana cost, and your max mana to all the way. Then just hold shift and launch meteor after meteor until he dies.