general in Yume Nikki ゆめにっき

THEORY - mystery man is based on this motherfucker (uboa)

also, in yume nikki, you travle the worlds throw DOORS... yk where im going

yeah, grey door and mystery man are yume nikki references

also most events in yume nikki are just some sprite stuff or so

cave story bruh

now im thinking, i can see that OMORI is like this :

Yume Nikki + Radiation's Halloween Hack = OMORI

hmmmmmmm...