Games like Shoot'n'Shell
Games like Shoot'n'Shell include Hades, Borderlands 2, Relic Hunters Zero: Remix, Hades II, and Warframe. We matched them by the tags players give Shoot'n'Shell on Steam (Action, Looter Shooter, Twin Stick Shooter, RPG, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Action · RPG

Borderlands 2
Shared: Action · Looter Shooter · Shooter

Relic Hunters Zero: Remix
Shared: Looter Shooter · Action · Twin Stick Shooter

Hades II
Shared: Action · Action Roguelike · RPG

Warframe
Shared: Looter Shooter · Action · RPG

Gunfire Reborn
Shared: Looter Shooter · Action · Action Roguelike

Borderlands 3
Shared: Looter Shooter · RPG · Action

OUTRIDERS
Shared: Looter Shooter · RPG · Action

Risk of Rain 2
Shared: Action Roguelike · Action · Looter Shooter

PAYDAY 2
Shared: Action · Looter Shooter · Shooter

Revita
Shared: Twin Stick Shooter · Action Roguelike · Looter Shooter

Tom Clancy’s The Division™
Shared: Looter Shooter · Action · RPG

Heroes of Hammerwatch II
Shared: RPG · Action · Action Roguelike

The First Descendant
Shared: Looter Shooter · Action · RPG

Tiny Tina's Wonderlands
Shared: Looter Shooter · RPG · Shooter

UnderMine
Shared: Action Roguelike · Action · RPG

Enter the Gungeon
Shared: Action Roguelike · Dungeon Crawler · Twin Stick Shooter

Shape of Dreams
Shared: Action Roguelike · Action · Dungeon Crawler

BioShock Infinite
Shared: Action · Shooter · RPG

Mortal Sin
Shared: Action Roguelike · Action · RPG

Relic Hunters Legend
Shared: Looter Shooter · Shooter · Twin Stick Shooter

Slasher's Keep
Shared: Action · Action Roguelike · RPG

Escape From Duckov
Shared: Action · Looter Shooter · Shooter

Terminull Brigade™
Shared: Looter Shooter · Action Roguelike · Action