Haha, this was quite fun! I like how the implication is that you can totally take over someone's thoughts and body with some nefarious means, but if you cause too much trauma they will just freak out. I didn't realize my first few runs that I had limited bullets, so I thought I had encountered a bug when I couldn't shoot anymore. The only real critique I have is that sometimes the gem will spawn right at the entrance and you can just walk in and right back out without even interacting with anyone.