OK, I played the game like seven times. I have had a lot of fun finding the key! I found it in a lot of clever locations!
Very fun, didn't expect to play it so many times but I enjoyed. There is room for improvement, maybe more sounds, maybe some color for the walls... I think there was a game already like this called "Dude where is my key?" so I can't exactly call it original, not sure if it follows the theme exactly, but I still had fun.
Out of curiosity, how many places can the key hide?