Games like Delved Too Deep
Games like Delved Too Deep include DAVE THE DIVER, Wall World, That's not my Neighbor, A Game About Digging A Hole, and OneShot. We matched them by the tags players give Delved Too Deep on Steam (Casual, Mining, Choices Matter, Exploration, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

DAVE THE DIVER
Shared: Casual · Exploration · Adventure

Wall World
Shared: Mining · Roguelite · Exploration

That's not my Neighbor
Shared: Casual · Choices Matter · Adventure

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

OneShot
Shared: Indie · Choices Matter · Multiple Endings

Emily is Away <3
Shared: Choices Matter · Casual · Multiple Endings

Melvor Idle
Shared: Casual · Mining · Indie

Meltopia
Shared: Mining · Exploration · Casual

Assassin's Creed® Odyssey
Shared: Exploration · Action-Adventure · Multiple Endings

To The Core
Shared: Casual · Mining · Adventure

Undertale
Shared: Choices Matter · Multiple Endings · Indie

Slime Rancher
Shared: Exploration · Adventure · Casual

Home Behind
Shared: Casual · Adventure · Indie

Detroit: Become Human
Shared: Choices Matter · Multiple Endings · Adventure

Reventure
Shared: Adventure · Multiple Endings · Indie

Road 96
Shared: Choices Matter · Adventure · Multiple Endings

A Short Hike
Shared: Exploration · Casual · Adventure

Terraria
Shared: Adventure · Exploration · Survival

Cairn
Shared: Exploration · Indie · Adventure

Emily is Away Too
Shared: Choices Matter · Casual · Indie

The Henry Stickmin Collection
Shared: Multiple Endings · Choices Matter · Singleplayer

The Wolf Among Us
Shared: Choices Matter · Adventure · Multiple Endings

Hollow Knight
Shared: Exploration · Indie · Adventure

The Forgotten City
Shared: Exploration · Choices Matter · Adventure