Blank Dream

Death is only the beginning for 16 year old Mishiro, who plans to throw herself into a nearby lake that's the source of local legends. But when she finds herself trapped in a dark and dangerous world, she also finds herself without her memories, and she'll need to regain them all, and possibly those of others stranded there, to find a way forward in this creepy and unsettling free indie horror adventure from Teriyaki Tomato.

Blank Dream is a freeware horror-exploration game by Kanawo (of Teriyaki Tomato) made in RPG Maker VX Ace.

Wishing that she had never even existed, Mishiro Usui threw herself into the lake.
When she came to, she was in the Mirror World, a place neither heaven nor hell.
There, her reflection instructed her: "Find the mirrors in this world, and break them."

WARNING: This game features many dark themes, with a particular focus on suicide.
It is recommended you not play this game if you feel the subject matter may be too much.