Thanks for the feedback!
Tbh this game is a walking simulator more than anything - we had plans to add more dynamic gameplay elements with enemies, but as is tradition in game jams we were super tight on time.
The room should change when you go back to that room if you've been through all the other rooms - stepping halfway through the room triggers a creepier version of the room and a brief ending after seeing all the other stuff. Might be a bug though, will have to check.
The cross is there as it's a prayer room - though mainly it's just to add a creepy vibe.