Games like Save The Astronaut
Games like Save The Astronaut include SANABI, Webbed, Momodora: Reverie Under The Moonlight, Broforce, and Celeste. We matched them by the tags players give Save The Astronaut on Steam (Side Scroller, 2D Platformer, Platformer, Survival, and Arcade): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: 2D Platformer · Action · 2D

Webbed
Shared: 2D Platformer · Cute · Platformer

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Side Scroller · 2D

Broforce
Shared: Platformer · Action · 2D

Celeste
Shared: Platformer · 2D Platformer · 2D

Rain World
Shared: Survival · Platformer · 2D

Rogue Legacy 2
Shared: Platformer · Arcade · Action

Twin Shot Deluxe
Shared: 2D Platformer · Arcade · Platformer

Öoo
Shared: 2D Platformer · Platformer · 2D

Sonic Origins
Shared: 2D Platformer · Platformer · Action

Sonic Mania
Shared: Platformer · 2D · Side Scroller

pureya
Shared: Arcade · Side Scroller · 2D

Katana ZERO
Shared: Platformer · 2D Platformer · Action

Thomas Was Alone
Shared: Side Scroller · Platformer · 2D Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · 2D · Side Scroller

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

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Platformer

Terraria
Shared: Survival · 2D · Pixel Graphics

Gal Guardians: Demon Purge
Shared: 2D Platformer · Side Scroller · Platformer

NINJA GAIDEN: Ragebound
Shared: Platformer · 2D Platformer · Side Scroller

Downwell
Shared: Platformer · 2D Platformer · Arcade

Deadlight
Shared: Platformer · Side Scroller · Action

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D