Games like FastFly
Games like FastFly include Hatsune Miku: Project DIVA Mega Mix+, Dead Space (2008), STAR WARS Jedi: Survivor™, ARMORED CORE™ VI FIRES OF RUBICON™, and Starfield. We matched them by the tags players give FastFly on Steam (Action, Rhythm, Space, Atmospheric, and Flight): closest matches first, and among equally close ones the better-known games.

Hatsune Miku: Project DIVA Mega Mix+
Shared: Rhythm · Action · Anime

Dead Space (2008)
Shared: Action · Space · Atmospheric

STAR WARS Jedi: Survivor™
Shared: Action · Singleplayer · Space

ARMORED CORE™ VI FIRES OF RUBICON™
Shared: Action · Third Person · 3D

Starfield
Shared: Space · Singleplayer · Third Person

Deliver Us The Moon
Shared: Action · Space · Atmospheric

DJMAX RESPECT V
Shared: Rhythm · Action · Anime

Warhammer 40,000: Space Marine 2
Shared: Action · Third Person · Space

STAR WARS™: Squadrons
Shared: Space · Flight · Action

Chorus
Shared: Action · Space · Flight

Trailmakers
Shared: Action · Space · Flight

EVERSPACE™
Shared: Action · Space · Flight

Rez Infinite
Shared: Rhythm · Action · Flight

Metal: Hellsinger
Shared: Rhythm · Atmospheric · Action

SpaceEngine
Shared: Space · 3D · Flight

Starpoint Gemini 2
Shared: Space · Action · Singleplayer

Prey
Shared: Space · Atmospheric · Action

PRAGMATA
Shared: Action · Futuristic · Singleplayer

Avorion
Shared: Space · Flight · 3D

Exo One
Shared: Space · Atmospheric · Flight

Sixtar Gate: STARTRAIL
Shared: Action · Rhythm · Space

Superflight
Shared: Flight · Action · Atmospheric

Call of Duty®: Infinite Warfare
Shared: Action · Space · Futuristic

Black Myth: Wukong
Shared: Action · Atmospheric · Singleplayer