Games like Gun Witch
Games like Gun Witch include Eastward, Honkai Impact 3rd, ASTLIBRA Revision, Eastern Exorcist, and Bloodstained: Ritual of the Night. We matched them by the tags players give Gun Witch on Steam (Adventure, RPG, Platformer, Shooter, and Action RPG): closest matches first, and among equally close ones the better-known games.

Eastward
Shared: Adventure · RPG · Action RPG

Honkai Impact 3rd
Shared: RPG · Adventure · Action RPG

ASTLIBRA Revision
Shared: Action RPG · RPG · JRPG

Eastern Exorcist
Shared: RPG · Adventure · Side Scroller

Bloodstained: Ritual of the Night
Shared: RPG · Adventure · Platformer

Dungeon Munchies
Shared: Adventure · RPG · Indie

Dust: An Elysian Tail
Shared: Platformer · RPG · Adventure

Broforce
Shared: Platformer · Shooter · 2D

SANABI
Shared: Adventure · 2D Platformer · Platformer

SCARLET NEXUS
Shared: RPG · Adventure · Action RPG

FINAL FANTASY VII REBIRTH
Shared: RPG · Adventure · JRPG

Afterimage
Shared: 2D Platformer · Side Scroller · Action RPG

ICEY
Shared: Adventure · RPG · Side Scroller

Rogue Legacy 2
Shared: Platformer · Adventure · RPG

Tales of ARISE
Shared: RPG · Action RPG · JRPG

Frontier Hunter: Erza’s Wheel of Fortune
Shared: Platformer · JRPG · Side Scroller

Ni no Kuni™ II: Revenant Kingdom
Shared: RPG · Adventure · JRPG

Pizza Tower
Shared: 2D Platformer · Platformer · Cartoony

Touhou Blooming Soul
Shared: Adventure · RPG · Action RPG

Celeste
Shared: Platformer · 2D Platformer · Adventure

Touhou Hero of Ice Fairy
Shared: Platformer · Side Scroller · Anime

Ys VIII: Lacrimosa of DANA
Shared: RPG · Adventure · JRPG

Metaphor: ReFantazio
Shared: RPG · Adventure · JRPG

Bladed fury
Shared: Adventure · RPG · Side Scroller