I don't write reviews too often, but I have the feeling that you can be really good at making games if you take a little bit more care with the next one you make. Anyway, this are my thoughts of what can be improved and what you don't need to really change.
I really liked the scary sounds, the background music, all the jumpscares (you really know when and how to put them) and the graphics.
What I didn't liked was the linearity, the entire game basically all you have to do is just go to the opposite direction you started, it gets more bored when the character you control is really slow. Even in the "self-destruction" part the astronaut walks, like nothing is happening, instead of run for his life! Other point that I didn't liked was the fact that you can't explore the spaceship or the moon. You just need to hold the left ou right button, and sometimes, press spacebar or click in something.
The last thing that I think you need to improve is the medals. Most part of the medals you gain just for reading the story, instead of actually doing something to get them. But I think this is just me, and my "easy medals" problem haha, so I'm not going to take half-star from this game because of that.
In the end, I enjoyed playing the game, and I look forward to see a sequel.
--Sorry for any misspelling, english is not my first language but I try my best to send the message I want.