I'm not sure why the main menu and graphics of the introduction look so much better than the actual game part, but maybe you can improve upon that. As I was playing the game, the main thing I wanted to know was, how I could interact with the doors and keys. So perhaps you can mention that somewhere on the itch page.
It would also be nice if the character can be controlled with wasd and if you have a 1 sec delay before resetting the character back to his cell. I also didn't see how you incorportated the theme into your game, but perhaps that's revealed when you get all of the keys.