A first-person adventure game with RPG elements, released by Microcabin in 1986. The game featured environments rendered in 3D polygon graphics, for possibly the first time in a home video game, along with early survival horror elements. However, the game is better remembered for its cyberpunk narrative, which was adapted into a sci-fi novel shortly afterwards.
Brain Breaker is an epic open-world platform-adventure for the Sharp X1 Japanese home computer. It was an early Metroidvania-style game, predating both Metroid and Castlevania. It was designed by Hiroshi Ishikawa and published by Enix in 1985.
Absolutely horrifying game and a nod to Lovecraftian horror. Wish more similar games came out.