Games like Tightrope Theatre
Games like Tightrope Theatre include Celeste, SANABI, Webbed, Pizza Tower, and Trine 5: A Clockwork Conspiracy. We matched them by the tags players give Tightrope Theatre on Steam (Action, Adventure, Action-Adventure, Platformer, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

SANABI
Shared: Action · Adventure · 2D Platformer

Webbed
Shared: 2D Platformer · Puzzle Platformer · Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Trine 5: A Clockwork Conspiracy
Shared: Action · Adventure · Platformer

Sonic Superstars
Shared: Action · Adventure · Platformer

Super Meat Boy
Shared: Platformer · Precision Platformer · 2D Platformer

I wanna be the Creator
Shared: Action · Action-Adventure · Platformer

BlazBlue Entropy Effect
Shared: Action · Action-Adventure · Platformer

Owlboy
Shared: Adventure · Platformer · Action

Trine Enchanted Edition
Shared: Action-Adventure · 2D Platformer · Puzzle Platformer

Sonic Origins
Shared: Action · Adventure · 2D Platformer

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure

Phoenotopia: Awakening
Shared: Action · Adventure · Platformer

Super Mombo Quest
Shared: Action · Adventure · Action-Adventure

Darwin's Paradox!
Shared: Action · Adventure · Action-Adventure

The Plucky Squire
Shared: Adventure · Action-Adventure · 2D Platformer

ANTONBLAST
Shared: Action · 2D Platformer · 2D

VVVVVV
Shared: Platformer · Precision Platformer · 2D Platformer

Sonic Mania
Shared: Platformer · 2D · Adventure

Jump King
Shared: Adventure · Precision Platformer · Action

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Broforce
Shared: Action · Platformer · 2D

Shovel Knight: Treasure Trove
Shared: Platformer · Adventure · Action