Confirmed: I'd be the worst spy ever
TURBOGUN has a "stealth-based precision platformer" up on Steam Greenlight called Master Spy that's looking for approval, but more importantly, there's a free in-browser demo ahead of a full release in 2014. You should try it out if words like "precision" don't sound overly frightening in the context of platform games centered around not being seen. Failure is practically inevitable here.
The game is broken down into individual rooms, most of which seem to be more about executing your plan of attack than actually solving the "puzzle" of how to traverse the environment safely and swiftly. Even with a cloaking suit, not getting caught is easier said than done.
Even though I tend to be fairly generous on Greenlight, I'm that much more likely to give a thumbs up when there's a playable build available and while Master Spy's trial isn't too extensive, it made enough of an impression on me to write this post. The GIFs helped too, if I'm being frank.
[Via Rock, Paper, Shotgun]