Games like BioGun
Games like BioGun include Hollow Knight, Ori and the Will of the Wisps, Hollow Knight: Silksong, Nine Sols, and GRIS. We matched them by the tags players give BioGun on Steam (Adventure, Atmospheric, Metroidvania, Singleplayer, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.
Hollow Knight
Shared: Metroidvania · Platformer · Singleplayer
Ori and the Will of the Wisps
Shared: Metroidvania · Adventure · Singleplayer
Hollow Knight: Silksong
Shared: Metroidvania · Singleplayer · Adventure
Nine Sols
Shared: Metroidvania · Hand-drawn · Atmospheric
GRIS
Shared: Atmospheric · Adventure · Hand-drawn
Constance
Shared: Metroidvania · Platformer · Adventure
MIO: Memories in Orbit
Shared: Metroidvania · Atmospheric · Singleplayer
Fallout 4
Shared: Singleplayer · Adventure · Atmospheric
Tomb Raider Game of the Year
Shared: Adventure · Singleplayer · Atmospheric
Stray
Shared: Adventure · Atmospheric · Singleplayer
Crypt Custodian
Shared: Adventure · Metroidvania · Atmospheric
Rise of the Tomb Raider™
Shared: Adventure · Singleplayer · Exploration
Rain World
Shared: Atmospheric · Exploration · Adventure
Night in the Woods
Shared: Adventure · Atmospheric · Singleplayer
Dust: An Elysian Tail
Shared: Metroidvania · Adventure · Platformer
Firewatch
Shared: Adventure · Atmospheric · Singleplayer
Dead Cells
Shared: Adventure · Metroidvania · Singleplayer
FAR: Lone Sails
Shared: Adventure · Atmospheric · Singleplayer
Unbound: Worlds Apart
Shared: Adventure · Atmospheric · Metroidvania
Islets
Shared: Adventure · Metroidvania · Atmospheric
ANIMAL WELL
Shared: Metroidvania · Atmospheric · Exploration
Owlboy
Shared: Adventure · Metroidvania · Atmospheric
Red Dead Redemption 2
Shared: Adventure · Singleplayer · Atmospheric
F.I.S.T.: Forged In Shadow Torch
Shared: Metroidvania · Adventure · Platformer