Games like Reach the Summit
Games like Reach the Summit include Terraria, Rain World, Pizza Tower, Forager, and Webbed. We matched them by the tags players give Reach the Summit on Steam (2D Platformer, Survival, 2D, Pixel Graphics, and Isometric): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Survival · 2D · Pixel Graphics

Rain World
Shared: Survival · Pixel Graphics · 2D

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Funny

Forager
Shared: Survival · Pixel Graphics · 2D

Webbed
Shared: 2D Platformer · Pixel Graphics · 2D

Celeste
Shared: Pixel Graphics · 2D Platformer · 2D

SANABI
Shared: Pixel Graphics · 2D Platformer · 2D

Among Us
Shared: Survival · 2D · Funny

Starbound
Shared: Survival · Pixel Graphics · Adventure

DAVE THE DIVER
Shared: Pixel Graphics · Casual · Adventure

Thank Goodness You're Here!
Shared: 2D Platformer · 2D · Funny

Baba Is You
Shared: Pixel Graphics · Logic · 2D

There Is No Game: Wrong Dimension
Shared: Pixel Graphics · 2D · Funny

The Final Station
Shared: Survival · Pixel Graphics · 2D

Öoo
Shared: 2D Platformer · 2D · Pixel Graphics

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Pixel Graphics · 2D

VVVVVV
Shared: Pixel Graphics · 2D Platformer · 2D

Super Meat Boy
Shared: 2D Platformer · Pixel Graphics · 2D

McPixel 3
Shared: Pixel Graphics · 2D · Funny

The Escapists
Shared: Pixel Graphics · 2D · Survival

Don't Starve Together
Shared: Survival · 2D · Adventure

Minit
Shared: Minimalist · Pixel Graphics · 2D

Sonic Origins
Shared: 2D Platformer · Pixel Graphics · 2D

Zup! S
Shared: 2D · Casual · Minimalist