I'm glad you figured it out thank you so much for playing it I really appreciate it I hope you enjoyed it:)
Ohhh I didn't realize you meant for that door. That one is solved using the note that you find in the box in that room.
The mirror is facing the wall, reflecting what is on it. So the code is what is on the wall reversed.
use the mirror
if you’re referring to the second locked door the code is hidden on the right side of the room. I think I need to make the activation area for the dialogue to appear a little bit larger. I appreciate the feedback:)