Love a tidy little Half-Life homage (though Fordon Greeman is a little on the nose!), and this makes for a great little diversion that fits into a single session. I do wish it had a little bit more to say about the aftermath, if used in a campaign - is there any way to get paid, how does the employer react to the failed test, that sort of thing - but it works fine standalone. The floor 2 and sub-floor colors on the map are a too similar to be legible at a glance for me.
Fun stuff!