Games like Donald Jump
Games like Donald Jump include Super Meat Boy, Celeste, Downwell, SANABI, and Momodora: Reverie Under The Moonlight. We matched them by the tags players give Donald Jump on Steam (Precision Platformer, Side Scroller, 2D Platformer, Runner, and Souls-like): closest matches first, and among equally close ones the better-known games.

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

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

SANABI
Shared: 2D Platformer · Action · Pixel Graphics

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

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Souls-like

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

Geometry Dash
Shared: Precision Platformer · 2D · Platformer

Broforce
Shared: Action · Platformer · Side Scroller

Huntdown
Shared: Side Scroller · Action · Precision Platformer

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

Hollow Knight
Shared: Souls-like · Platformer · 2D

Super Meat Boy Forever
Shared: Precision Platformer · Runner · Platformer

Gravity Circuit
Shared: Platformer · Action · 2D Platformer

Katana ZERO
Shared: 2D Platformer · Action · Platformer

Terminator 2D: NO FATE
Shared: Side Scroller · 2D Platformer · Arcade

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

Bō: Path of the Teal Lotus
Shared: Precision Platformer · Side Scroller · 2D Platformer

BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien
Shared: Precision Platformer · Side Scroller · Runner

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

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

pureya
Shared: Arcade · Side Scroller · 2D

Sonic Origins
Shared: 2D Platformer · Action · Platformer

Ambidextro
Shared: Precision Platformer · 2D Platformer · Action