Ha ha! Very nice. It really re-creates the feeling of "trapped" from the game.

really like this one!

Thanks a lot! Guten Rutsch nach Hamburg!

This is great... I loved the GameBoy!

I wish you would have been alive earlier, so games like this actually exist :P

D'awesome!

Thanks/Danke, guys!

Sieht sehr gut aus.. ich wünscht sowas gäbe es für Gameboy.....

Awesome!

Yeah, they do. Du hast da offensichtlich auch ein Händchen dafür.

gb colors rule! ;-)

Thanks for your comment, and thanks for your welcome, Manupix! I'll heed your advice on the airlock first, and I'll try to add shadows to the items you mentioned as soon as I find the time. I actually considered doing the latter before, but then I was unsure whether I should use "black" shadows because I thought they might stand out too much; on the other hand, I didn't want to use different colours for those shadows because that would have been inconsistent with the monsters/marines.

Pretty good, welcome!

There might be some directions for improvement: the foreground monsters as well as pipes and drums cast little or no shadow, and lack other obvious ground contact such as stains; the foreground monsters don't have as good volume and texture as the other sprites; the airlock door doesn't recess into the wall. And even with 4 colors you might add AA and reduce banding on the sprites outlines.