Aliens, fun! What engine did you do this in--was it just HTML5? I'm always impressed when someone makes a game with that!
I have a couple of suggestions about how you could improve this game. First, the different characters and props are drawn in a lot of different art styles and they're also a lot of different sizes, and some of them (especially the backgrounds) are squashed or stretched, so sometimes it looks like you're walking above the ground, etc. It would be easier to tell what's going on if all the art were the same scale and style. (Having a dedicated artist would help.)
And second, the gameplay mostly went in a straight line--usually in one room someone would give you an item, and in the next room someone would ask for it, so it was very easy to solve. It would be more fun if you mixed it up--someone in a later room could give you something that you need to go back and use at the beginning, or you could allow us to move more directions than just forward or back, or some of the obstacles could be something different than giving one item to one person. I think stuff like that would make it more interesting to play.