I'm looking for the title of this game about a female hikkomori who is unnamed throughout the game. She apparently stays in her room(as hikkomori usually do) and eventually somehow enters this "other world". At the end of the game, she finally leaves her room and goes onto the roof, where she jumps(? or something to that extent). Does anybody know the name of this game?

Apparently, one of the scenes from this game is supposed to be scary, because the hikkomori enters the "other world" and has to enter this room like 50 times, turning the lights on and off before this creature thing pops out. It's a GBA game(I think), so it wasn't that scary though.....

Yume Nikki, maybe?

LSD Dream Emulator seems similar, but it's on PS1 (although I don't know on which platform Yume Nikki is).

It's Yume Nikki.

It's also a PC game. But I heard it is being remade into a system.

You guys are right, it is Yume Nikki. Thanks!