This app was mentioned in 4 comments, with an average of 2.50 upvotes
Okay so, having done a bit of research, RSM stands for READY STEADY MENTAL. It's a VR game developed for the Google Cardboard by CptSub, Submachine Factory & xkubazz (which is Jakub Ziembiński, a dev of the SUPERHOT team) and the SUPERHOT Team (of course). I believe it was a way to bring attention to SUPERHOT and as you mentioned:
> I think this might happen to you once you go into "The core," but damn, this is creepy.
I'm pretty sure that's what they were aiming for... and boy was it done well. The use of ASCII makes it even more terrifying than it really looks, but I guess that's just the style of SUPERHOT (though the trailer itself is quite... daunting).
Download link: https://play.google.com/store/apps/details?id=com.subfty.rsm
have fun and play responsibly!
DL link: https://play.google.com/store/apps/details?id=com.subfty.rsm
Have fun and play responsibly!