I enjoyed this one very much. The story is cool and the puzzles are satisfying and challenging without being impossible to solve on your own. The only thing I noticed that I didn't like was that they used pictures of a xenomorph and a facehugger from Alien, and a Graboid from Tremors. And not like they made something look similar to them. They used actual pictures of those things from those movies. But everything else was great!
I finished it in about six hours. The game does a great job of making the solutions easy to figure out with a little bit of critical thinking. I only needed to look up to the solution to a problem one time, and I was 90% of the way there myself anyway. It was definitely worth the two dollars I paid for it.