Thanks for the feedback! I'm glad you liked the atmosphere. I will probably change the layout for moving in between the cells in the next iteration.
Regarding the switch, I will make it more clear what it does. Currently, I have a text that says unlock the door when you go near the switch but I think some visual hint to indicate it is related to the door would be ideal. I am thinking I will probably change it to a keycard/scanner system to make it more clear.