Decent
It's okay, it's kind of hard because you don' know exactly what you're trying to get to. I couldn't figure our the password for the computer on the 2nd level though. I thought it would be what was on the note, which looked like 5647, and I tried everything like 5547, 564, etc. I was locked in the room so I gave up. Alright though, maybe more detailed mission explanations.