The Mystery Dungeon clone 
Touhou Genso Wanderer Reloaded was one of those games I picked up on the strength of my experience with it at a PAX, specifically at the sparsely-populated UNTIES booth in 2018. This was a year before I played Touhou Eiyashou: Imperishable Night, which was my proper introduction to the Touhou series. Later on, I would play through its predecessor, Touhou Youyoumu: Perfect Cherry Blossom, before starting the Switch port of Genso Wanderer, my first Touhou spinoff, more than a year later.
As it turns out, Genso Wanderer would lead me to starting a third mainline Touhou game, and the last one I had in my backlog: Touhou Fuujinroku: Mountain of Faith. This was because there are several prominent characters in Genso Wanderer who were first introduced in Mountain of Faith, the tenth entry in the core series of magical shmups. Two of these characters, Aya and Sanae, star in their own post-game sidestories in Genso Wanderer; another one, the kappa Nitori, plays a key role tied to the crafting system; and the rest of the cast make notable appearances at various points. While there are a bevy of characters from all over the Touhou canon featured throughout, I got the impression that Genso Wanderer‘s developers must’ve loved Mountain of Faith in particular.