What can I say about it?
Well, there are a few things I can say about it.
Let's start with the gameplay. First off, the gameplay is very simple, yet satisfying. The textures for the levels set the mood for the story, also. Great job.
Second, the story in general. Now, when I first started playing, I quickly caught on that it was something like the Matrix (where there are people plugged into a machine where life as they know it is false, leading to a destroyed, decayed world outside). However, it was a very intriguing to learn who "Mama" was.
3rd. The ending. Now, this is what confused me the most. Why leave the ending at a cliffhanger? I can assume, though, that there will be a sequel to end it and answer more questions.
TL;DR: The game is amazing, and I'm looking forward to another.