Games like Melt Them All
Games like Melt Them All include Vampire Survivors, Megabonk, Oxygen Not Included, Hades, and Skul: The Hero Slayer. We matched them by the tags players give Melt Them All on Steam (Action Roguelike, Roguelite, Automation, Singleplayer, and Bullet Time): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Singleplayer

Megabonk
Shared: Action Roguelike · Roguelite · Survival

Oxygen Not Included
Shared: Survival · Base Building · Singleplayer

Hades
Shared: Action Roguelike · Roguelite · Singleplayer

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · Singleplayer

Cult of the Lamb
Shared: Action Roguelike · Base Building · Singleplayer

Factorio
Shared: Automation · Base Building · Survival

Brotato
Shared: Action Roguelike · Singleplayer · Roguelite

Dyson Sphere Program
Shared: Automation · Base Building · Simulation

BALL x PIT
Shared: Roguelite · Action Roguelike · Arcade

20 Minutes Till Dawn
Shared: Action Roguelike · Roguelite · Survival

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

Halls of Torment
Shared: Action Roguelike · Roguelite · Pixel Graphics

Everything is Crab: The Animal Evolution Roguelite
Shared: Action Roguelike · Roguelite · Survival

The Last Caretaker
Shared: Automation · Survival · Base Building

Dungreed
Shared: Action Roguelike · Roguelite · Singleplayer

EVERSPACE™
Shared: Action Roguelike · Roguelite · Singleplayer

Dead Cells
Shared: Action Roguelike · Roguelite · Pixel Graphics

UnderMine
Shared: Action Roguelike · Roguelite · Singleplayer

RimWorld
Shared: Survival · Base Building · Singleplayer

Rogue Legacy
Shared: Action Roguelike · Singleplayer · Roguelite

Mindustry
Shared: Automation · Base Building · Tower Defense

Satisfactory
Shared: Automation · Base Building · Survival

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Singleplayer