Really liked what you have so far.
I got the keycard, but couldn't interact with the keycard reader. I'm not sure if I'm at the wrong place, or if that part is not done yet.
Interesting premise, of course adding sound will help a lot to set the mood, but I really liked it so far, specially the opening puzzle. Perhaps you could add a shortcut with the keyboard, where you press a key, and next time you click with the mouse it automatically checks or interacts with the environment (and have an indicator on the HUD showing which one is active). I understand the need for a mouse-only setup, but adding this shortcut could speed up things a lot.
Also, and most importantly, you need to revise the opening text. There are typos and some missing words, and you don't want this type of mistake at any point in the game, much less in the opening.