I'm a big fan of classic Metal Gear so getting to see that stealth like gameplay put in a more action oriented scenario while still including the jingle when you fail (oh yeah, I heard it :P) was cool to see. Not sure why but looks like only coffee calmed me down but only while the boss had not realized I was not at my desk or has spotted me. It felt like it was pretty much game over soon as the boss go near you.
Also, I think I got him stuck for a bit while I played games :P