so, sort of like >>2890 I have a theory tying the fangames and original game together.
maddysuki was friends with both sabitsuki and urotsuki, and they visited her on a consistent basis even when she pulled the whole "LOL I'MMA GO SHUT IN NOW" thing. soon, though, she started focusing more on dreaming and less on them, and started being more testy when they visited. soon, she got so pissed that they wouldn't leave her be, she threatened sabitsuki at knifepoint to leave her alone, that they were stopping her from visiting her "real" friends. obviously at this point, madotsuki was insane, so they stopped visiting altogether and distracted themselves from her. urotsuki turned to hallucinogens, as she thought tripping her non-existant balls off would be more fun than dealing with an insane shut-in. sabitsuki was a little less fortunate, and the thoughts of the incident continued to haunt her throughout everyday life.
soon, though, they began to think that leaving her alone in an apartment would end up badly for other people, so they decided to go and check the building to see if anyone else had been affected. as they were walking up, however, urotsuki screamed and pointed towards the balcony. there was madotsuki, about to jump off of it, and when she did, they both darted off in opposite directions and didn't look back.
of course, you can't just leave a scene like that like nothing happened, so they both slowly crept back towards her body, stopping and staring at their late ex-friend. sabi and uro standing there was somehow thought of, in mado's dying, insane mind, as the jellyfish creatures wandering up to the blood splat in the ending. this was all just a story to her, and here was the ending.
as a result, sabitsuki and urotsuki both locked themselves away, and their dreams were influenced by their feelings and responses to this whole saga. (uro = trippy, but with excerpts of blood and sadness, sabi = bloody and rusty, heavy notes of sadness and death)
kiddies all across japan heard about this on the news and how lucid dreaming could produce trippy-ass dreams. being the silly teenyboppers that they were, they went "oh, I wanna do that TOO! cool!" cue the shit tons of fangames and their sad discoveries of how lucid dreaming is not always sun and rainbows.