Games like Apple Hopper
Games like Apple Hopper include Papers, Please, Celeste, There Is No Game: Wrong Dimension, Super Meat Boy, and DAVE THE DIVER. We matched them by the tags players give Apple Hopper on Steam (Precision Platformer, Runner, Perma Death, Point & Click, and 2D): closest matches first, and among equally close ones the better-known games.

Papers, Please
Shared: Point & Click · Simulation · Pixel Graphics

Celeste
Shared: Precision Platformer · Pixel Graphics · 2D

There Is No Game: Wrong Dimension
Shared: Point & Click · Pixel Graphics · Adventure

Super Meat Boy
Shared: Precision Platformer · 2D · Pixel Graphics

DAVE THE DIVER
Shared: Pixel Graphics · Adventure · Simulation

Downwell
Shared: Precision Platformer · Pixel Graphics · 2D

Jump King
Shared: Precision Platformer · Pixel Graphics · 2D

VVVVVV
Shared: Precision Platformer · Pixel Graphics · 2D

That's not my Neighbor
Shared: Point & Click · Simulation · Adventure

Game Dev Tycoon
Shared: Simulation · 2D · Indie

Noita
Shared: Pixel Graphics · 2D · Perma Death

The Escapists
Shared: Pixel Graphics · 2D · Simulation

Geometry Dash
Shared: Precision Platformer · 2D · Singleplayer

SANABI
Shared: Pixel Graphics · 2D · Adventure

Vampire Survivors
Shared: 2D · Pixel Graphics · Singleplayer

Beat Cop
Shared: Pixel Graphics · Simulation · Adventure

McPixel 3
Shared: Point & Click · Pixel Graphics · 2D

People Playground
Shared: 2D · Simulation · Singleplayer

Graveyard Keeper
Shared: Pixel Graphics · Simulation · Singleplayer

Plague Inc: Evolved
Shared: Simulation · Singleplayer · Tactical

McPixel
Shared: Point & Click · Pixel Graphics · 2D

Five Nights at Freddy's: Into the Pit
Shared: 2D · Pixel Graphics · Adventure

The End Is Nigh
Shared: Precision Platformer · 2D · Adventure

Stardew Valley
Shared: Pixel Graphics · Simulation · Indie