Games like Monster Battle
Games like Monster Battle include Vampire Survivors, Kingdom Rush - Tower Defense, Mount & Blade II: Bannerlord, Hades, and Town of Salem. We matched them by the tags players give Monster Battle on Steam (Strategy, RPG, Action Roguelike, Casual, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · 2D · Casual

Kingdom Rush - Tower Defense
Shared: Strategy · 2D · Casual

Mount & Blade II: Bannerlord
Shared: Strategy · RPG · Action

Hades
Shared: Action Roguelike · Indie · Action

Town of Salem
Shared: Strategy · RPG · Casual

Melvor Idle
Shared: RPG · Casual · Indie

Plebby Quest: The Crusades
Shared: Strategy · RPG · Casual

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Strategy · Indie

UFO 50
Shared: Strategy · Indie · RPG

Have a Nice Death
Shared: Action Roguelike · 2D · 2D Platformer

Rogue Legacy
Shared: Action Roguelike · Indie · RPG

Bardbarian
Shared: Strategy · RPG · Casual

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · 2D

Game Dev Tycoon
Shared: Strategy · Casual · Indie

Skul: The Hero Slayer
Shared: Action Roguelike · Indie · Action

Death Must Die
Shared: Action Roguelike · RPG · 2D

The Escapists
Shared: Strategy · 2D · Singleplayer

Plague Inc: Evolved
Shared: Strategy · Casual · Indie

ShellShock Live
Shared: Strategy · 2D · Casual

Kingdom Rush 5: Alliance TD
Shared: Strategy · 2D · Cartoon

Idle Champions of the Forgotten Realms
Shared: Strategy · RPG · Casual

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · 2D · Casual

The Last Spell
Shared: Strategy · RPG · Singleplayer

Home Behind
Shared: RPG · Strategy · Casual