I love the concept!
I'm a huge Aliens fan and I absolutely love the concept!
Graphics wise the game is very good. There's a very creepy atmosphere here. No need to improve much here.
Audio wise the sounds the were alright, and the music wasn't too annoying. However, those little machine gun sounds really got old, very quick. If you made it so that the weapon sounds mixed up a little or just scraped them all together and tried something a little more easier on the ears that would be no bad thing.
The game play was alright but...My only complaint was the linearity. It was always forward forward, there wasn't a whole lot to explore. And the Aliens popping out of the tunnel got old very quickly. If they had to come racing down the tunnel toward you, and you had to fire at them while doing so, would have been a better way to execute this I think.
*SPOILER* And are you supposed to die after the Queen battle? I've tried that three times and each time I end up in the embryo chamber.
So in point, Graphics are fine, some sounds became annoying, and the game play is fun but so linear there's really no replay value. I love this concept and hope you improve and continue on it!
7/10