Cool idea! I'll start out with the things I liked:
I like your models (I assume you made them yourself). I appreciate the time you put into the datacube messages. I also liked the music, though it did get repetitive.
However, I think you could improve on a couple things. First, some technical things: the camera was really difficult to use and it got in the way of playing the game. Also, I felt like the movement was too slow and I found myself looking for a sprint button or something. Oh, and I got stuck when I put both cubes into the same terminal in the first room.
In terms of gameplay, I think it got repetitive fast. I didn't feel like I was really doing anything when I was playing besides reading messages. Maybe you could have come up with a better way to present the messages and have less time walking between each one. Maybe you could've added a puzzle or something where I could use the messages for something as well. I'm just spitballing.
I can tell you were learning when you made this, which is awesome, and I think you should definitely keep making more and have fun improving as you go. I noticed on your profile that this is your first 3D game and it's a pretty good first-start!