momiji_and_the_mysterious_cave
Momiji and the Mysterious Cave (Japanese name: 椛と不思議の洞窟, romanized Momiji to Fushigi no Doukutsu) is a roguelike in the vein of the Mysterious Dungeon games, created by BACKSPACE. The player takes the role of Inubashiri Momiji and treks through a multi-floor dungeon to face off against most of the rest of the Touhou cast. As of version 0.90b, every character up through Mountain of Faith can be encountered.
(Description taken from the Touhou Wiki.)