Games like Drown World
Games like Drown World include Terraria, A Game About Digging A Hole, Vampire Survivors, Core Keeper, and The Binding of Isaac: Rebirth. We matched them by the tags players give Drown World on Steam (Action, Mining, Sandbox, Procedural Generation, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Pixel Graphics · 2D

A Game About Digging A Hole
Shared: Mining · Sandbox · Exploration

Vampire Survivors
Shared: Action Roguelike · Pixel Graphics · Action

Core Keeper
Shared: Sandbox · Exploration · Pixel Graphics

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Pixel Graphics · Local Co-Op

BlazBlue Entropy Effect
Shared: Action · Action Roguelike · 2D

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Pixel Graphics

No Man's Sky
Shared: Exploration · Procedural Generation · Sandbox

Dead Cells
Shared: Action Roguelike · Pixel Graphics · 2D

Forager
Shared: Sandbox · Pixel Graphics · Action

Ocean Keeper: Dome Survival
Shared: Action · Mining · Procedural Generation

UnderMine
Shared: Action Roguelike · Action · Pixel Graphics

Dome Keeper
Shared: Action · Procedural Generation · Singleplayer

Broforce
Shared: Action · Pixel Graphics · Local Co-Op

Wizard of Legend
Shared: Action Roguelike · Action · Pixel Graphics

Content Warning
Shared: Procedural Generation · Action Roguelike · Exploration

鬼谷八荒 Tale of Immortal
Shared: Sandbox · Action · Singleplayer

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Local Co-Op

Planet Centauri
Shared: Sandbox · Exploration · Mining

Starbound
Shared: Sandbox · Pixel Graphics · Exploration

Risk of Rain Returns
Shared: Action Roguelike · Action · Local Co-Op

Wall World
Shared: Mining · Pixel Graphics · Procedural Generation

Death Road to Canada
Shared: Action Roguelike · Action · Local Co-Op

Noita
Shared: Sandbox · Pixel Graphics · Action