Games like The Arena Guy
Games like The Arena Guy include Escape From Duckov, Hades II, Last Epoch, Warframe, and Wolcen: Lords of Mayhem. We matched them by the tags players give The Arena Guy on Steam (Arena Shooter, Action, Top-Down Shooter, Hack and Slash, and RPG): closest matches first, and among equally close ones the better-known games.

Escape From Duckov
Shared: Action · Top-Down Shooter · Shooter

Hades II
Shared: Action · Hack and Slash · Roguelike

Last Epoch
Shared: Hack and Slash · RPG · Action

Warframe
Shared: Action · RPG · Action RPG

Wolcen: Lords of Mayhem
Shared: Hack and Slash · Action · RPG

Hero Siege
Shared: Hack and Slash · RPG · Action RPG

Path of Exile 2
Shared: Hack and Slash · RPG · Action RPG

Hades
Shared: Hack and Slash · Action · Roguelike

Black Myth: Wukong
Shared: Action · RPG · Action RPG

The Ascent
Shared: Top-Down Shooter · Action · RPG

Brotato
Shared: Arena Shooter · Roguelike · Survival

Borderlands 2
Shared: Action · Shooter · RPG

Warhammer 40,000: Inquisitor - Martyr
Shared: Action · Hack and Slash · RPG

Titan Quest II
Shared: Hack and Slash · Action · RPG

Killsquad
Shared: Action · Top-Down Shooter · Hack and Slash

NieR:Automata™
Shared: Hack and Slash · RPG · Action

Torchlight: Infinite
Shared: Hack and Slash · RPG · Action

Torchlight II
Shared: RPG · Hack and Slash · Action RPG

UNDECEMBER: The Farside
Shared: Hack and Slash · RPG · Action

The Incredible Adventures of Van Helsing
Shared: Action · Hack and Slash · RPG

Minecraft Dungeons
Shared: Hack and Slash · Action · RPG

PUBG: BATTLEGROUNDS
Shared: Survival · Action · Shooter

FatalZone
Shared: Arena Shooter · Top-Down Shooter · Survival

Grim Dawn
Shared: Hack and Slash · RPG · Action RPG