Games like Discard the Heart
Games like Discard the Heart include Gorogoa, SANABI, Katana ZERO, Defy Gravity Extended, and Planet of Lana. We matched them by the tags players give Discard the Heart on Steam (Casual, Action, Puzzle, 2D Platformer, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Gorogoa
Shared: Puzzle · Hand-drawn · Casual

SANABI
Shared: Action · Pixel Graphics · 2D Platformer

Katana ZERO
Shared: Action · Pixel Graphics · 2D Platformer

Defy Gravity Extended
Shared: Puzzle · Action · Singleplayer

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

Dome Keeper
Shared: Action · Singleplayer · Sci-fi

FEZ
Shared: Puzzle · Casual · Pixel Graphics

CARRION
Shared: Action · Pixel Graphics · Singleplayer

Vampire Survivors
Shared: Pixel Graphics · Casual · Singleplayer

Timberman
Shared: Casual · Action · Pixel Graphics

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Singleplayer

There Is No Game: Wrong Dimension
Shared: Puzzle · Casual · Pixel Graphics

Zup! S
Shared: Casual · Puzzle · Singleplayer

Deliver Us The Moon
Shared: Action · Singleplayer · Puzzle

Pony Island
Shared: Puzzle · Singleplayer · Pixel Graphics

Unpacking
Shared: Casual · Puzzle · Pixel Graphics

Outer Wilds
Shared: Puzzle · Space · Exploration

Waveform
Shared: Puzzle · Casual · Singleplayer

Gunpoint
Shared: Puzzle · Action · Singleplayer

Out There Somewhere
Shared: Puzzle · Pixel Graphics · Action

Poppy Playtime
Shared: Puzzle · Singleplayer · Dark

OneShot
Shared: Pixel Graphics · Puzzle · Singleplayer

VVVVVV
Shared: Pixel Graphics · 2D Platformer · Singleplayer

Baba Is You
Shared: Puzzle · Singleplayer · Pixel Graphics