OK, you seem to have a good beginning to your game, but here's what will make it even better:
1) put something that looks like a safe behind the "lock"
2) Make there be some kind of discernible pattern to unlock it, not just random guesswork.
3) Add multiple levels with higher difficulty.
4) Limit the number of tries a person has.
If you do these things it will start to change this from a good concept to a good game.
Not a "creepy game", not hard, not "a game with a nice concept", not an "addicting coop mode" marginally a game at all. Also, I have no problem with games in other languages, but if you are going to try to use English at least try to spell it almost correctly, for example they, rats, and go should not be misspelled.
 "You are a... The Sequel"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Safe Breaker V1"){kind=icon}
 "The Really Pretty Button"){kind=icon}
 "Pixelvader"){kind=icon}
 "Clear Vision"){kind=icon}
 "GeoSketch"){kind=icon}
 "Pong (Rukia/Asterisk)"){kind=icon}
 "Bunni: How we first met"){kind=icon}
 "William and Sly"){kind=icon}
 "Hedgehog Launch 2"){kind=icon}
 "Book of Mages: The Chaotic Period"){kind=icon}
 "The Classroom 2"){kind=icon}
 "Crunchball 3000"){kind=icon}
 "A Small Favor"){kind=icon}
 "Creepee Gaym"){kind=icon}
 "Death Vegas"){kind=icon}