Games like Heal The Survivors
Games like Heal The Survivors include Vampire Survivors, Skul: The Hero Slayer, Slime Rancher, Rogue Legacy, and Have a Nice Death. We matched them by the tags players give Heal The Survivors on Steam (Cute, Action, Family Friendly, Funny, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: 2D · Bullet Hell · Singleplayer

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Slime Rancher
Shared: Cute · Singleplayer · Funny

Rogue Legacy
Shared: Action · Roguelike · Singleplayer

Have a Nice Death
Shared: Action · Funny · Singleplayer

PRAGMATA
Shared: Cute · Action · Funny

Haunt the House: Terrortown
Shared: Cute · Action · Funny

Undertale
Shared: Funny · Singleplayer · 2D

Pikuniku
Shared: Cute · Indie · Action

Gang Beasts
Shared: Action · Funny · Singleplayer

Cat Goes Fishing
Shared: Cute · Funny · 2D

We Love Katamari REROLL+ Royal Reverie
Shared: Cute · Action · Singleplayer

Untitled Goose Game
Shared: Funny · Cute · Family Friendly

Stick It to the Stickman
Shared: Action · Funny · Roguelike

Plants vs. Zombies GOTY Edition
Shared: Singleplayer · Family Friendly · 2D

Mini Ninjas
Shared: Action · Cute · Family Friendly

Party Animals
Shared: Cute · Funny · Action

Overcooked! 2
Shared: Funny · Family Friendly · Action

Enter the Gungeon
Shared: Roguelike · Bullet Hell · Indie

Mahjong
Shared: Action · Funny · Cute

Cult of the Lamb
Shared: Cute · Singleplayer · Action

Little Witch Nobeta
Shared: Cute · Funny · Action

Megabonk
Shared: Roguelike · Action · Indie

Donut County
Shared: Cute · Funny · Indie