Sorry I was busting that thing out in a rush earlier. Let me add some extra explanation!
The level has basically two phases; stealth, and hunt & destroy. The stealth phase involves stealing the actual labcoat item, then walking non-chalantly (so no jumping or crawling - you're a scientist for god's sake, act like one!) to the elevator to the lower levels. When you arrive in 1B, the other scientists warn you not to go in there, somethings gone horribly wrong, and they're going to gas the lower levels despite the trapped assistant in subbasement 3. But of course, you're Guy Fucking Balding, and you're not about to let that happen! Being a fellow scientist thanks to your labcoatedness, you continue through the white door, and as you leap up onto the first pile of debris, your coat falls away, and you get your acrobatics on!
1 - The hole in reception is there mainly for fun. If players should try to go in there, they'll be caught right away if they're not wearing their labcoat yet.
2 - You're right about there being a bug in the Staging Area. And in Reception really - I had ladders there, but I forgot why, and took them out at the last minute. NOW I remember why - so you could walk back across without losing your labcoat! Thanks for the sharp eyes

That will be fixed in the final version.
3 - Xion, the right side of Lab 1A is a little bit boring, I'll try to spice it up!
4 - You get the serums from Lab 2D. There will be 3 different serums in there, then once you rescue the lab assistant, a 4th.
5 - I think when you get caught like the whole screen will flash red, klaxons and sirens, then fade to black, and basically resets. Though now that you've mentioned it, i don't see any way NOT to include the MGS '!'s :D
6 - Yeah actually I want people to visit Reception right after they get the labcoat, just to hear the receptionist or loudspeaker say something funny right off the bat. BUT, I want to also have special text from all the scientists if you return to the upper levels after slaying the Mouse Queen, like "oh man Guy Balding you are so awesome - science can't even handle it!!"
7 - You can not walk through debris/damaged.
Finally, I will be pixeling the crap out of this level over the next week I promise :D will be a decent amount of animation involved as well, but I think it will be worth it!