Games like ASTRA
Games like ASTRA include SANABI, Oozi: Earth Adventure, Super Fancy Pants Adventure, Gorogoa, and Her Story. We matched them by the tags players give ASTRA on Steam (Stylized, Typing, 2D Platformer, Choose Your Own Adventure, and Space Sim): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: 2D Platformer · 2D · Action

Oozi: Earth Adventure
Shared: 2D Platformer · Old School · Indie

Super Fancy Pants Adventure
Shared: 2D · Stylized · Action

Gorogoa
Shared: Stylized · Indie · Puzzle

Her Story
Shared: Typing · Choose Your Own Adventure · Puzzle

Braid
Shared: 2D Platformer · 2D · Indie

60 Seconds! Reatomized
Shared: Choose Your Own Adventure · 2D · Point & Click

Planet of Lana
Shared: 2D Platformer · Action · Puzzle

Thank Goodness You're Here!
Shared: 2D Platformer · Adventure · 2D

Dino Run DX
Shared: Dinosaurs · 2D · Runner

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

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

Progressbar95
Shared: Typing · 2D · Casual

Pizza Tower
Shared: 2D Platformer · Indie · 2D

Sonic Origins
Shared: 2D Platformer · Action · Adventure

Celeste
Shared: 2D Platformer · 2D · Indie

Webbed
Shared: 2D Platformer · 2D · Indie

Worldless
Shared: Stylized · 2D Platformer · 2D

Prince of Persia The Lost Crown
Shared: 2D Platformer · Stylized · Side Scroller

ANTONBLAST
Shared: 2D Platformer · 2D · Action

Sonic Superstars
Shared: 2D Platformer · 2D · Action

The Henry Stickmin Collection
Shared: Choose Your Own Adventure · 2D · Indie

SHINOBI: Art of Vengeance
Shared: 2D Platformer · 2D · Action

Mark of the Ninja: Remastered
Shared: 2D · Action · Indie