Games like EndlessEx
Games like EndlessEx include Melvor Idle, DAVE THE DIVER, Thank Goodness You're Here!, Florence, and There Is No Game: Wrong Dimension. We matched them by the tags players give EndlessEx on Steam (Casual, Adventure, Racing, Motorbike, and Runner): closest matches first, and among equally close ones the better-known games.

Melvor Idle
Shared: Casual · Adventure · 2D

DAVE THE DIVER
Shared: Casual · Adventure · Singleplayer

Thank Goodness You're Here!
Shared: Adventure · Casual · 2D

Florence
Shared: Casual · Adventure · Indie

There Is No Game: Wrong Dimension
Shared: Adventure · Casual · Indie

Strange Jigsaws
Shared: Casual · Adventure · 2D

Terraria
Shared: Adventure · 2D · Crafting

Little Inferno
Shared: Casual · Singleplayer · Indie

To The Core
Shared: Casual · Adventure · 2D

Razortron 2000
Shared: Casual · Racing · Indie

Don't Starve
Shared: Adventure · Singleplayer · Crafting

Pikuniku
Shared: Adventure · Casual · Indie

That's not my Neighbor
Shared: Casual · Adventure · 2D

BEEP
Shared: Adventure · 2D · Casual

Potion Craft: Alchemist Simulator
Shared: Singleplayer · Casual · Crafting

SANABI
Shared: Adventure · 2D · 2D Platformer

Reventure
Shared: Adventure · 2D · Indie

Hollow Knight: Silksong
Shared: 2D · Indie · Adventure

Scribblenauts Unlimited
Shared: Casual · Adventure · 2D

South Park™: The Stick of Truth™
Shared: Adventure · Dark Humor · Singleplayer

How to Make an Atomic Bomb in Your Garden
Shared: Adventure · Casual · Indie

DISTRAINT: Deluxe Edition
Shared: Adventure · 2D · Indie

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · 2D

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · Racing