Games like Astonishing
Games like Astonishing include Stardew Valley, Papers, Please, The Binding of Isaac: Rebirth, Vampire Survivors, and WorldBox - God Simulator. We matched them by the tags players give Astonishing on Steam (Sports, Action Roguelike, Simulation, God Game, and Farming Sim): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Pixel Graphics · Simulation

Papers, Please
Shared: Simulation · Indie · Pixel Graphics

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Pixel Graphics

Vampire Survivors
Shared: Action Roguelike · Pixel Graphics · Indie

WorldBox - God Simulator
Shared: Simulation · God Game · Pixel Graphics

The Test
Shared: Simulation · Multiple Endings · Pixel Graphics

Skul: The Hero Slayer
Shared: Action Roguelike · Indie · Pixel Graphics

Session: Skate Sim
Shared: Sports · Simulation · Singleplayer

Emily is Away Too
Shared: Simulation · Indie · Pixel Graphics

Mountain
Shared: Simulation · Indie · God Game

Atomicrops
Shared: Action Roguelike · Farming Sim · Pixel Graphics

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Indie

PIPE by BMX Streets
Shared: Sports · Simulation · Indie

Megabonk
Shared: Action Roguelike · Indie · Pixel Graphics

Fields of Mistria
Shared: Farming Sim · Simulation · Pixel Graphics

Simmiland
Shared: Simulation · God Game · Indie

DRAPLINE
Shared: Simulation · Multiple Endings · Pixel Graphics

Hades
Shared: Action Roguelike · Indie · Singleplayer

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Indie

Teamfight Manager
Shared: Simulation · Sports · Pixel Graphics

EA SPORTS FC™ 26
Shared: Sports · Simulation · Singleplayer

DAVE THE DIVER
Shared: Pixel Graphics · Simulation · Singleplayer

ScooterFlow
Shared: Sports · Simulation · Indie

Sun Haven
Shared: Farming Sim · Pixel Graphics · Simulation