As long as the use is non-commercial copyright can not be violated actually, it would be fair-use (in a certain range of use, anyway).
Seeing as the game is free to play, unreleased and currently paypal "donations" only buy you to-be-developed features this classifies as fair use. Naturally, when the game actually releases.. proper own artworks have to be used. Unless permission is obtained for the artwork used currently. (I am particularly skittish when seeing the photo based images, not so much fictional logos (Although "Weyland Industries" as a name is definitely trade-marked)
For the record, I am freelance artist (eRe4s3r.deviantart.com) so I have to work with fair use and all that nonsense... I think people need to understand that in an Alpha things are place-holder and the crowd funding has not yet finished. He can only possibly do his own art when he actually has a budget to do own art... simple