For anyone curious about info for the fangame where Shikyo Ungaikyō here it is:
The fangame is actually a series of (hopefully) 5 fangames called Touhou Gyakusetsu Meiro ~ Quantum Reality Shift of The Spirit (東方逆説迷路~Quantum Reality Shift of The Spirit).
Similarly to IN, the game will feature a partner system where focusing changes the character, however, you can switch who the main character is and what there bullet type is. For example: if you pick the duo of Reimu and Marisa, although Reimu is the default main of the duo and the default for both is Bullet Type A, you can switch the main to Marisa and give her Bullet Type A while Reimu has Bullet Type B, and any other possible combinations.
Each game will feature a secret stage (The only way I’ll tell you who the the characters that will feature in them is if you guess) which in order to unlock, you must 1CC the game on any difficulty except Easy, and enter the Konami Code in the main screen (⬆️⬆️⬇️⬇️⬅️➡️⬅️➡️BA). When done correctly, the pichuun sound will play, then play the game as normal and then once you have finished selecting your characters, instead if being greeted by the first stage, you’ll be met by the secret stage, which has the same difficulty as the Extra Stage.
Each character in your duo will have their own bomb that changes depending on whether you chose bullet type A or B, for example: choosing Bullet Type A with Okuu will give her Mega Flare, while Bullet Type B will give her Uncontrollable Nuclear Reaction Dive. Also, each playable character will have a Last Word which can be activated by pressing X and Z at the same time, the Last Word instantly defeats any boss except the Final, Extra, and Secret Boss and can only be used once per game.
The game will also (hopefully) have a tutorial mode featuring Hieda no Akyuu and other lesser characters such as Kozusu Motoori. This tutorial is meant for people who have never played a Touhou game in their life, have forgotten how to play, and/or are being shown this from a friend. This mode functions like a usual tutorial, however there will be a part where you are taught about Graze, bombs, Last Words, and other things relating to danmaku. The goal is to dodge the danmaku but if you decide to get hit to see what will happen, you’ll receive two warnings, and if you’ve persisted to the third time: you’ll be tossed into a Phantasm level stage. If this stage is defeated, you’ll receive a remark where the character asks why you’re in the tutorial and kicks you out.