Games like Ephemerid: A Musical Adventure
Games like Ephemerid: A Musical Adventure include Geometry Dash, A Dance of Fire and Ice, GRIS, Hollow Knight: Silksong, and Muse Dash. We matched them by the tags players give Ephemerid: A Musical Adventure on Steam (Indie, Adventure, Rhythm, Music, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Geometry Dash
Shared: Music · Rhythm · Great Soundtrack

A Dance of Fire and Ice
Shared: Rhythm · Music · Indie

GRIS
Shared: Indie · Adventure · Great Soundtrack

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

Muse Dash
Shared: Rhythm · Music · Great Soundtrack

Firewatch
Shared: Adventure · Atmospheric · Singleplayer

Hollow Knight
Shared: Indie · Great Soundtrack · Singleplayer

Journey
Shared: Adventure · Indie · Atmospheric

Just Shapes & Beats
Shared: Rhythm · Music · Great Soundtrack

Little Nightmares
Shared: Adventure · Singleplayer · Atmospheric

OneShot
Shared: Indie · Great Soundtrack · Atmospheric

Chants of Sennaar
Shared: Adventure · Indie · Singleplayer

Brothers - A Tale of Two Sons
Shared: Adventure · Indie · Atmospheric

Hyper Light Drifter
Shared: Indie · Adventure · Great Soundtrack

Bastion
Shared: Indie · Great Soundtrack · Singleplayer

Seen
Shared: Indie · Adventure · Singleplayer

BPM: BULLETS PER MINUTE
Shared: Rhythm · Indie · Adventure

To the Moon
Shared: Indie · Adventure · Great Soundtrack

Thumper
Shared: Indie · Rhythm · Great Soundtrack

Metal: Hellsinger
Shared: Rhythm · Music · Singleplayer

Neon Beats
Shared: Rhythm · Indie · Music

Outer Wilds
Shared: Adventure · Great Soundtrack · Indie

Ori and the Will of the Wisps
Shared: Adventure · Singleplayer · Great Soundtrack

Stray
Shared: Adventure · Singleplayer · Atmospheric