It's a very interesting mechanic but I had a tough time trying to beat it. Trying to spot the slimes with the mirror is too hard and I couldn't figure out how to open the safe. Are there supposed to be three digits to open it?
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Yeah, balancing how much the reflections show the monsters and still make it see behind you was a weird balance.
The code for the safe is 4 numbers, which are all only seen as reflections using the phone. They can be a bit tricky to find without knowing they're there. There is a number inside each room that opens with a key, whether it be in the mirrored or regular version of the house.
Thanks for the feedback, I was hoping the numbers wouldn't be too hidden. I'll keep that in mind.