The stealth electronic music fits the style really well. The controls are also on point. And the best mechanic in my opinion is the spotting with the light color change and alarm.
From the beginning I just used the blue dude, leaving the red behind. To perfect my strategy I first crammed red in the corner then took blue to the first key. Then red to the next. And then round trip to finish the game.
I think level design needs a bit of an upgrade if you want the link mechanism to work better. Also, I had no clue as to where to look for the keys. No lights, no pointers, no hints.