The concept is pretty similar to many stealth game, but it's still easy to learn and fun to play regardless.
I got stuck on the scene with the blue guy facing me across the table. I'm not sure if that's the ending screen. Like another comment have said, making the cops shoot you when seen is the same as a game over. There's also a bug: when you start placing the poster while moving that causes you to continue moving. The relation with the theme feels forced, so you might want to be careful when designing the game next time. It did happen to me in the past.
Great job on submitting the game!