Games like Onyx
Games like Onyx include Greyfox RPG, Tales of the Black Forest, ICEY, Bloodstained: Ritual of the Night, and DAVE THE DIVER. We matched them by the tags players give Onyx on Steam (Adventure, Casual, RPG, Indie, and Anime): closest matches first, and among equally close ones the better-known games.

Greyfox RPG
Shared: Adventure · Indie · RPG

Tales of the Black Forest
Shared: RPG · Adventure · Indie

ICEY
Shared: Adventure · Anime · Female Protagonist

Bloodstained: Ritual of the Night
Shared: RPG · Adventure · Female Protagonist

DAVE THE DIVER
Shared: Casual · Adventure · RPG

Forward to the Sky
Shared: Adventure · Anime · RPG

Epic Battle Fantasy 4
Shared: Adventure · Indie · JRPG

Atelier Sophie 2: The Alchemist of the Mysterious Dream
Shared: RPG · Anime · JRPG

Slime Rancher
Shared: Adventure · Exploration · Casual

Dungeon Munchies
Shared: Adventure · Indie · RPG

Touhou Mystia's Izakaya
Shared: Casual · RPG · Anime

Tales of Berseria™
Shared: RPG · Anime · JRPG

WitchSpring R
Shared: RPG · Female Protagonist · JRPG

Chrono Ark
Shared: RPG · Anime · Adventure

Mirror 2: Project X
Shared: Anime · Female Protagonist · RPG

Coffin of Ashes
Shared: Adventure · RPG · Anime

沉睡的法则 Things as They Are
Shared: RPG · Adventure · JRPG

千面 Melancholy Love
Shared: Casual · Indie · Adventure

Bladed fury
Shared: Adventure · Indie · RPG

Epic Battle Fantasy 5
Shared: Adventure · Indie · JRPG

Fleeting Iris
Shared: Adventure · RPG · Casual

Nexomon
Shared: Adventure · RPG · Casual

WILL: A Wonderful World / WILL:美好世界
Shared: RPG · Adventure · Indie

Little Witch Nobeta
Shared: Anime · Adventure · Female Protagonist