I ran this game last year and discovered a few tricks. Here's a video of the run:
http://www.twitch.tv/guhbadoo/c/2318122
I plan revisiting it at sometime because I think I can improve it over a minute without too much trouble but for now that's the run I have.
Some things I found:
-In stage 1 some of the switches can be skipped. You don't need to deactivate the claws because Nick can run right through them if he's in a precise location. I think this is only possible with Nick, but I could be wrong.
-I could not for the life of me find out what determines the spawn location of the fake ID in stage 3. I thought it may have been set based on health or position at the end of stage 2 but I don't think it is. It has been a while since I messed around with it so again, I could be wrong. The first ID is determined based on when you press start before the stage begins. I didn't try testing the others.
-You can walk along the very edge of sensors and not be detected, and you can walk along the edges of sewage in stage 1 and not take damage.
-Punching and then immediately moving will cancel the attack animation, allowing you to move more quickly.
If I think of anything else I will be sure to post it here.
