Movies like Coherence and It's What's Inside?

I like both of these movies and in a way they gave me similar vibes. I like the idea that things get really crazy and it's hard to tell what's going on, or you don't know who's who. Any other movies like this?

I was thinking of checking out Flatliners, but I'm not sure which one to watch, the original or the remake. Not sure if Flatliners is this kind of movie or not tbh.