Thank you so much for the detailed review and suggestions: As for the music,due to religious reasons, I won't be able to make "Instrumental" music at least, I'll find a way around it eventually
As for the walk sound,I'm not really a sound designer or anything so I used the voices I got in my hand directly without trying to adjust them, but it's the first time I hear this detailed advice about how to make irrepetetive, I'll apply it for sure.
And as for that puzzle, I really did make sure to give you the exact seconds you need to reopen the door and get out of the level too, but it seems I had to make a level for this, I'll consider this in future releases. Thanks again!