Heres some additional Genres from the Unofficial Backrooms Playlist:
Drone Music
Drone music, drone-based music, or simply drone, is a minimalist genre that emphasizes the use of sustained sounds, notes, or tone clusters – called drones. It is typically characterized by lengthy audio programs with relatively slight harmonic variations throughout each piece.
Industrial
Industrial music is a genre of music that draws on harsh, transgressive or provocative sounds and themes. AllMusic defines industrial music as the "the most abrasive and aggressive fusion of rock and electronic music"
Space Rock
Space rock is a rock music genre characterized by loose and lengthy song structures centered on instrumental textures that typically produce a hypnotic, otherworldly sound.
Ambient Music
Ambient music is a genre of music that emphasizes tone and atmosphere over traditional musical structure or rhythm. A form of instrumental music, it may lack net composition, beat, or structured melody.
Vaporwave
Vaporwave is a microgenre of electronic music, a visual art style, and an Internet meme that emerged in the early 2010s. It is defined partly by its slowed-down, chopped and screwed samples of smooth jazz, elevator, R&B, and lounge music from the 1980s and 1990s.