Games like REUNITE!
Games like REUNITE! include ICEY, Momodora: Moonlit Farewell, The Vagrant, BlazBlue Entropy Effect, and TEVI. We matched them by the tags players give REUNITE! on Steam (Action, Action-Adventure, Side Scroller, 2D, and Anime): closest matches first, and among equally close ones the better-known games.

ICEY
Shared: Action · Side Scroller · Anime

Momodora: Moonlit Farewell
Shared: Action-Adventure · 2D · Anime

The Vagrant
Shared: Action · 2D · Side Scroller

BlazBlue Entropy Effect
Shared: Action · Action-Adventure · 2D

TEVI
Shared: Action-Adventure · Anime · 2D

Skul: The Hero Slayer
Shared: Action · 2D · Indie

Rabi-Ribi
Shared: Anime · Action-Adventure · Side Scroller

AI LIMIT
Shared: Anime · Action · Action-Adventure

Black Myth: Wukong
Shared: Action · Action-Adventure · Combat

Indivisible
Shared: Action · Anime · Hand-drawn

Crimson Desert Enhanced
Shared: Action · Action-Adventure · Fantasy

Wuthering Waves
Shared: Action · Anime · Free to Play

Shantae: Half-Genie Hero
Shared: Action · Side Scroller · Anime

SANABI
Shared: Action · 2D · Action-Adventure

9 Years of Shadows
Shared: Side Scroller · Anime · Action-Adventure

KurtzPel
Shared: Action · Anime · Free to Play

Bloodstained: Ritual of the Night
Shared: Action · Side Scroller · Anime

Eastern Exorcist
Shared: Action · Side Scroller · 2D

Mina the Hollower
Shared: Action-Adventure · Top-Down · 2D

Monster Boy and the Cursed Kingdom
Shared: Action · 2D · Side Scroller

Touhou Hero of Ice Fairy
Shared: Side Scroller · Anime · Female Protagonist

SCARLET NEXUS
Shared: Action · Anime · Action-Adventure

Constance
Shared: Action · 2D · Action-Adventure

8Doors: Arum's Afterlife Adventure
Shared: Action · Action-Adventure · Side Scroller