Games like Overseer
Games like Overseer include Exanima, VR Dungeon Knight, Warhammer 40,000: Inquisitor - Martyr, Wolcen: Lords of Mayhem, and Last Oasis. We matched them by the tags players give Overseer on Steam (Action, Indie, Early Access, Adventure, and RPG): closest matches first, and among equally close ones the better-known games.

Exanima
Shared: RPG · Dungeon Crawler · Action

VR Dungeon Knight
Shared: Action · Adventure · RPG

Warhammer 40,000: Inquisitor - Martyr
Shared: Action · RPG · Adventure

Wolcen: Lords of Mayhem
Shared: Action · RPG · Indie

Last Oasis
Shared: Action · RPG · Adventure

G2 Fighter / 基因特工
Shared: Action · Indie · Adventure

The Incredible Adventures of Van Helsing
Shared: Action · RPG · Indie

Seen
Shared: Indie · Adventure · Dark

UnderMine
Shared: Indie · Action · RPG

Blightbound
Shared: Indie · Action · Adventure

Dungeon Munchies
Shared: Action · Indie · Adventure

Notes of Soul
Shared: Action · Adventure · Indie

Hammerwatch
Shared: Indie · Action · Dungeon Crawler

Ancient Dungeon
Shared: Action · Adventure · Indie

Dust: An Elysian Tail
Shared: Action · Indie · RPG

Last Epoch
Shared: RPG · Action · Adventure

Minecraft Dungeons
Shared: Action · Adventure · Dungeon Crawler

Path of Exile 2
Shared: RPG · Action · Dungeon Crawler

Minecraft Dungeons II
Shared: Action · Adventure · RPG

Touhou Blooming Chaos 2
Shared: Action · Indie · Adventure

Hades
Shared: Indie · Action · Dungeon Crawler

Torchlight II
Shared: RPG · Dungeon Crawler · Action

The Binding of Isaac
Shared: Indie · Action · Dark

Bastion
Shared: Indie · Action · RPG