Games like Dungeon Digger
Games like Dungeon Digger include Terraria, Dead Cells, The Escapists, Forager, and Don't Starve. We matched them by the tags players give Dungeon Digger on Steam (Adventure, Singleplayer, 2D, Mystery Dungeon, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: 2D · Adventure · Pixel Graphics

Dead Cells
Shared: Adventure · 2D · Pixel Graphics

The Escapists
Shared: Singleplayer · Pixel Graphics · 2D

Forager
Shared: Pixel Graphics · Adventure · 2D

Don't Starve
Shared: Adventure · Singleplayer · Survival

The Rewinder
Shared: Adventure · Singleplayer · Pixel Graphics

DAVE THE DIVER
Shared: Adventure · Pixel Graphics · Singleplayer

Stoneshard
Shared: Pixel Graphics · 2D · Singleplayer

The Survivalists
Shared: Adventure · Singleplayer · Crafting

There Is No Game: Wrong Dimension
Shared: Adventure · Puzzle · Pixel Graphics

Finding Paradise
Shared: Adventure · 2D · Pixel Graphics

OneShot
Shared: Pixel Graphics · Singleplayer · Adventure

Romestead
Shared: Adventure · 2D · Crafting

Impostor Factory
Shared: Adventure · 2D · Pixel Graphics

Starbound
Shared: Adventure · Pixel Graphics · Survival

Graveyard Keeper
Shared: Pixel Graphics · Singleplayer · Crafting

Don't Starve Together
Shared: Adventure · Survival · Crafting

Skul: The Hero Slayer
Shared: Pixel Graphics · 2D · Singleplayer

SANABI
Shared: Pixel Graphics · Adventure · Singleplayer

The Forest
Shared: Adventure · Survival · Crafting

Five Nights at Freddy's: Into the Pit
Shared: Adventure · 2D · Singleplayer

Hyper Light Drifter
Shared: Adventure · Pixel Graphics · Singleplayer

Rise of the Tomb Raider™
Shared: Adventure · Singleplayer · Puzzle

Void Stranger
Shared: Singleplayer · Adventure · Puzzle