Games like OlliOlli
Games like OlliOlli include Celeste, Hollow Knight, Hollow Knight: Silksong, Geometry Dash, and Katana ZERO. We matched them by the tags players give OlliOlli on Steam (Skateboarding, Indie, Sports, 2D, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Indie · Pixel Graphics · Platformer

Hollow Knight
Shared: Platformer · Indie · 2D

Hollow Knight: Silksong
Shared: Indie · 2D · Great Soundtrack

Geometry Dash
Shared: 2D · Great Soundtrack · Difficult

Katana ZERO
Shared: Pixel Graphics · Indie · Platformer

Shovel Knight: Treasure Trove
Shared: Indie · Pixel Graphics · Platformer

Super Meat Boy
Shared: Indie · Platformer · Pixel Graphics

Skul: The Hero Slayer
Shared: Indie · Pixel Graphics · 2D

The Binding of Isaac: Rebirth
Shared: Indie · Pixel Graphics · Difficult

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

Vampire Survivors
Shared: Pixel Graphics · Indie · 2D

SANABI
Shared: Pixel Graphics · Indie · 2D

Cuphead
Shared: Platformer · 2D · Indie

Timberman
Shared: Indie · Pixel Graphics · 2D

Hotline Miami
Shared: Indie · Great Soundtrack · Pixel Graphics

Risk of Rain (2013)
Shared: Indie · Platformer · Pixel Graphics

Out There Somewhere
Shared: Indie · Pixel Graphics · Platformer

VVVVVV
Shared: Indie · Pixel Graphics · Platformer

Hotline Miami 2: Wrong Number
Shared: Pixel Graphics · Great Soundtrack · Indie

A Dance of Fire and Ice
Shared: Indie · 2D · Singleplayer

Blasphemous
Shared: Pixel Graphics · 2D · Indie

Session: Skate Sim
Shared: Skateboarding · Sports · Indie

The Messenger
Shared: Platformer · Pixel Graphics · 2D

Hyper Light Drifter
Shared: Indie · Pixel Graphics · Great Soundtrack