Games like HiHi
Games like HiHi include Shelldiver, Celeste, Webbed, Slime Rancher 2, and Geometry Dash. We matched them by the tags players give HiHi on Steam (Casual, Simulation, Platformer, 2D Platformer, and Precision Platformer): closest matches first, and among equally close ones the better-known games.

Shelldiver
Shared: Casual · Incremental · Simulation

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Webbed
Shared: 2D Platformer · Platformer · Cute

Slime Rancher 2
Shared: Simulation · Casual · Cute

Geometry Dash
Shared: Precision Platformer · 2D · Platformer

Nodebuster
Shared: Casual · Simulation · Incremental

Insaniquarium Deluxe
Shared: Casual · Incremental · Simulation

Laughing to Die
Shared: Casual · Platformer · 2D Platformer

Thomas Was Alone
Shared: Platformer · 2D Platformer · Precision Platformer

Placid Plastic Duck Simulator
Shared: Casual · Simulation · Cute

Digseum
Shared: Casual · Simulation · Incremental

Passpartout: The Starving Artist
Shared: Casual · Simulation · Hand-drawn

GRIS
Shared: Platformer · Hand-drawn · Atmospheric

Unfair Flips
Shared: Casual · Simulation · Incremental

Sticky Business
Shared: Casual · Simulation · Cute

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

Unpacking
Shared: Casual · Simulation · Cute

PowerWash Simulator
Shared: Casual · Simulation · Relaxing

A Game About Feeding A Black Hole
Shared: Casual · Incremental · Simulation

Chef Knight
Shared: Simulation · Casual · Incremental

Sonic Superstars
Shared: Platformer · Casual · 2D Platformer

Russian Life Simulator
Shared: Simulation · Incremental · 2D

Brawlhalla
Shared: Casual · 2D Platformer · Platformer

JellyCar Worlds
Shared: 2D Platformer · Precision Platformer · Simulation