Does the FPS controller feel good? Such as walking, jumping, falling, looking etc.
I would say that the fps controller feel good. The movement feels swift (which is what I guess you were going for). On the other hand, if you want to make the controls more realistic, I would slow them down a little bit.
Do you prefer pressing a key to pick up items or not?
I think pressing a key to pick up items if fine in terms of practicality and functionality of the game.
How do you find the environment?
I think the environment is very well done and I am interested in seeing what it would look like as a final project/product.
Did you feel like Gordon Freeman for a second?
HA HA HA. I have no idea who that is.