Touhou Mother is a fan-made crossover game of Touhou and EarthBound/MOTHER, made by 'S'.Made in RPG Maker 2000, the game begins when a Meteor crashes into Gensokyo. After Reimu and Marisa fight of the mysterious alien that arrived with it, they find an unconscious boy nearby, who reveals that he has no memories. Soon after, things go to hell in Gensokyo. Not that that stops the lightheartedness and endless references to other works.The translated game can be found here, while a playthrough can be found here. A sequel to the game, Return of Touhou Mother, is currently being uploaded as a series of videos by vgperson here.
This game contains examples of:
Amnesiac Dissonance: When he first arrives, Porky has no memory of his past. Later, he pretends to to be this to mask the fact that he remembers everything.
And Now for Someone Completely Different: After Reimu, Marisa and Yuka are sent to Old Gensokyo, Sanae stars in her own chapter. She returns after Reimu collects the seventh melody.
The Cavalry Arrives Late: Played with horribly near the climax, when everyone else shows up and mistakes the roboticised Reimu, Marisa and Tenshi for mere Mooks.
Clipped Wing Angel: Tenshi gives Scarlet Weather Rhapsody of All Mankind a second try during her second fight... and the Rainbow Sword can't take it and snaps to pieces, which knocks her out.
The Dragon: Tenshi works against the heroes more than almost anyone else, effortlessly beats down Remilia and Yukari, and unlike the other Touhou characters is never persuaded to switch sides until the very end of the game, after Porky turns her into a robot to cover his escape.
Darker and Edgier: Especially on the take of the relationship between humans and youkai in Gensokyo.
Demoted to Extra: While the gameplay leans decidedly towards the MOTHER side of things, the characters from said series are for the most part pushed to the wayside.
Not so on the sequel though.
Future Badass: A few characters become this after the party returns from Old Gensokyo.
Guest Star Party Member: Several, always filling a 'fifth' slot. These include Nitori, Sanae and Tenshi.
Gods Need Prayer Badly: Source of a fairly bigMood Whiplash in the sequel. En route to your next destination you happen upon Sanae and a very transparent Kanako. They explain that the incidents in the previous game caused a great many humans to no longer believe in or care about gods, so Kanako's physical being is vanishing from the world. And then when you return to that area later, neither Kanako nor Sanae are present.
Grey and Gray Morality: Are the humans justified in liberating themselves from the youkai they had feared for so long by merging Gensokyo with the Outside World? Or is it the youkai who are justified in keeping the humans under their thumb if it means preserving Gensokyo?
Fake-Out Fade-Out: Both times against Tenshi's final attack. The first time has Ridley's battle music, the second time has Bhava Agra As Seen Through A Child's Mind start back up at full force.
Fantastic Racism: One of the conflicts for the sequel, found near the end of Chapter 1. Porky was just the nudge needed for the humans and youkai to realize just how much they disliked each other.
Let's Play: Naka Teleeli has a blind run beginning here, where he points out many of the Shout Outs and references. Notably includes character 'cheat sheets' to help anyone unfamiliar with the Touhou series, and a quick summary of the events of the MOTHER series as an optional starting point.
Lightning Bruiser: Mima hits almost as hard as Yuka, is faster than Marisa and has some of the most powerful offensive and healing spells right from the beginning.
Medium Awareness: Marisa likes to make references to game mechanics, particularly the four-person party aspect.
The Revolution Will Not Be Civilized: The humans who want to rebel against the youkai's rule aren't portrayed in a positive light. After all, they are led by Porky and if they get what they want, Gensokyo will vanish as the consequence.
Time Skip: The sequel is set six months after the end of Touhou Mother. It Got Worse since then.
Took a Level in Badass: Cirno goes from goofy comic relief boss battle to one of the more difficult boss battles in the game sometime while the party is stuck in Old Gensokyo.
The sequel has Yukari bring some of the most powerful youkai in Gensokyo together and forcefully takeing over, under the impression that should humans get any sort of power they will always abuse it.