I liked the concept. As you mentioned, you had to cut corners and that is normal in a jam. If you had the time you should have highlighted the noise bar a bit, it's black in a dark background. It's hard to know what can you interact with. And the movement mechanic needed some thought, it's really slow and if you sprint you just get caught, no strategy involved. For instance, maybe you could only sprint when he is snoaring so he won't hear you, you could have a time limit that forced you to use sprint, etc. I liked the graphics, sound would help a lot, especially because the game is about being quiet.