Strange game! I appreciate how easy it was to pick up and the eerie silence of the room. The small amount of animation also adds a lot of value.
The puzzle is, of course, very simple but I think it's a great jumping off point for a larger project of this type.
I typed in the wrong code like 5 times because the 4 looks like a 9... I can't be the only one!
Anyway, good job on this.