Games like Riverhill Trials
Games like Riverhill Trials include Hollow Knight, Ori and the Will of the Wisps, Hollow Knight: Silksong, A Hat in Time, and GRIS. We matched them by the tags players give Riverhill Trials on Steam (Indie, Adventure, Action, Platformer, and Space): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · Great Soundtrack

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

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Platformer

A Hat in Time
Shared: Adventure · Indie · Great Soundtrack

GRIS
Shared: Indie · Adventure · Great Soundtrack

Pumpkin Jack
Shared: Adventure · Action · Indie

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

Seen
Shared: Indie · Adventure · Singleplayer

Sonic Adventure 2
Shared: Action · Great Soundtrack · Platformer

Psychonauts
Shared: Adventure · Platformer · Action

Dust: An Elysian Tail
Shared: Action · Indie · Platformer

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

Sonic Adventure DX
Shared: Platformer · Adventure · Great Soundtrack

Portal 2
Shared: Platformer · Singleplayer · Funny

Outer Wilds
Shared: Adventure · Space · Great Soundtrack

Crash Bandicoot™ N. Sane Trilogy
Shared: Platformer · Adventure · 3D Platformer

Deliver Us The Moon
Shared: Indie · Adventure · Action

Tiny and Big: Grandpas Leftovers
Shared: Indie · Platformer · Adventure

Deadlight
Shared: Indie · Action · Platformer

Celeste
Shared: Indie · Platformer · Great Soundtrack

A Story About My Uncle
Shared: Adventure · Indie · Platformer

Bastion
Shared: Indie · Action · Great Soundtrack

Hyper Light Drifter
Shared: Indie · Adventure · Great Soundtrack

Yooka-Laylee
Shared: Adventure · Indie · Platformer

