The gun gave me a false sense of security at first, but that ended quickly :)
The design of the place and the awesome texture work - really makes you feel like you're exploring a giant weird alien superstructure. Then there are these cryptic messages, like R=2.
That corridor with flickering lights and enemies around - such a panic-enduing location.
I found a computer in what looked like an office (?) you could type names into, but none worked. I tried Lisa and all the ones displayed.
Couldn't beat the game yet, I would probably have to restart from the beginning to have a little more health, and use my weapon more strategically.
Overall it's great, I really like the mood and environment design, the controls feel very appropriate, amazing work!