Ooh. Nice one. I love the big cheesy smile on the astronaut. Maybe he’s friends with the alien squid. Or he just hasn’t notices. If he hasn’t noticed he’ll probably be eaten soon. Then he won’t have that cheesy grin :D
Haha. Awesome. I think you should just draw shadows instead of using gradients though. Otherwise. Awesome. (I especially like the nebula-esque thing and of course, the astronaut.)