Games like Raygun Gadabout
Games like Raygun Gadabout include Hollow Knight, Hollow Knight: Silksong, Ori and the Will of the Wisps, Prince of Persia The Lost Crown, and MIO: Memories in Orbit. We matched them by the tags players give Raygun Gadabout on Steam (Metroidvania, Hand-drawn, Space, Exploration, and 1990's): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Exploration · Hand-drawn

Hollow Knight: Silksong
Shared: Metroidvania · Exploration · Indie

Ori and the Will of the Wisps
Shared: Metroidvania · Action · Exploration

Prince of Persia The Lost Crown
Shared: Metroidvania · Exploration · Action

MIO: Memories in Orbit
Shared: Metroidvania · Exploration · Atmospheric

Nine Sols
Shared: Metroidvania · Hand-drawn · Action

Crypt Custodian
Shared: Metroidvania · Exploration · Action

Constance
Shared: Metroidvania · Hand-drawn · Action

Dust: An Elysian Tail
Shared: Metroidvania · Action · Adventure

ANIMAL WELL
Shared: Metroidvania · Exploration · Atmospheric

Outer Wilds
Shared: Space · Exploration · Adventure

Monster Boy and the Cursed Kingdom
Shared: Metroidvania · Action · Adventure

GRIS
Shared: Hand-drawn · Atmospheric · Adventure

No Man's Sky
Shared: Space · Exploration · Adventure

Unbound: Worlds Apart
Shared: Metroidvania · Adventure · Exploration

Rain World
Shared: Exploration · Atmospheric · Metroidvania

Momodora: Reverie Under The Moonlight
Shared: Metroidvania · Exploration · Side Scroller

Haiku, the Robot
Shared: Metroidvania · Exploration · Adventure

Axiom Verge
Shared: Metroidvania · Action · Indie

Gato Roboto
Shared: Metroidvania · Action · Adventure

Bloodstained: Ritual of the Night
Shared: Metroidvania · Action · Adventure

Road 96
Shared: 1990's · Colorful · Adventure

DEVIATOR
Shared: Metroidvania · Hand-drawn · Action

SteamWorld Dig 2
Shared: Metroidvania · Adventure · Action