Games like Zombie Idle Defense
Zombie Idle Defense. These games share the most with it, and each one says why.

Idle Kingdom DefenseDormant
Also idle, tower defense, combat
Command heroes and archer corps in large castle-defense battles, with rewards stacking up while the game is closed.
75% idle
Medieval: Defense & ConquestDormant
Also tower defense, idle, combat
Build a crusader settlement's farms and trade, then spend the income on an army and walls to hold off waves of attackers.

Tower Defense: Lazy ApocalypseUpdated
Also tower defense, idle, combat
Play a monster-slaying streamer holding off zombie waves, upgrading weapons while your hero keeps fighting when you are away.
75% idle
Zero Stress King: Idle DefenseUpdated
Also tower defense, idle
A tower defense where you cannot lose: enemies charge your walls and fall into lava, and you spend the payout on defenders and a map-shaped skill tree.
87% steam3.6★ galaxy
Abyss Manager Idle
Also tower defense, idle
Assign characters to jobs, gather resources and dig deeper floors in an idle tower defense. About two hours to finish completely.
95% steamhas ending
Marisa!ReturnTheBook!
Also idle, combat
A Touhou fan game where you craft Shanghai dolls styled after Gensokyo characters to storm Marisa's house and recover her borrowed books.
90% steam
Slimeward
Also combat, idle
Turn a slime that landed outside your house into resources, building up a village and recruiting heroes strong enough to beat it.
89% steam
All Aboard! The Train Defense Express
Also tower defense, combat
Defend a power generator from waves of orcs with a looping train, buying combat and gold-making carriages and merging three alike to level them.
91% steam
Pacifish
Also idle, combat
Fish six areas, fight back against what you disturb, hatch and eat fish for stats, and craft poles, playable idly or actively for speed.
84% steam50% idle
Alien Invasion: RPG Idle SpaceUpdated
Also combat, idle
Guide an alien that eats humans to grow stronger, evolve its abilities and beat bosses in new locations.

Archer Forest : Idle DefenseUpdated
Also idle, combat
Defend a forest with animal archers by merging arrows into stronger ones, clearing stages, and beating bosses for loot.

Battle Simulator: Idle WarfareUpdated
Also idle, combat
Recruit fighters from many eras, from Spartans to helicopters, and watch them clash in automatic battles.

Clicker Heroes - Idle SlayerUpdated
Also idle, combat
Tap to fight waves of monsters and recruit a team of heroes with their own abilities, in the mobile version of a long-running idle RPG.

Combo Clash - Era WarsUpdated
Also tower defense, combat
Merge weapon blocks on a grid to power a hero against waves of enemies, advancing through eras from cavemen to future soldiers.

Dead Spreading:Idle GameDormant
Also idle, tower defense
Recruit soldiers and upgrade a base to hold off zombie waves while balancing defense and supply gathering.

Demigod Idle: Rise of a legendDormant
Also idle, combat
Play a demigod stripped of angelic and demonic power, regaining it through fast idle growth and flashy 2.5D battles.

Dice vs Monsters: Roguelike TDUpdated
Also tower defense, idle
A roguelike tower defense where each hero is a die, with dice rolls used to upgrade abilities against monster waves.

Dungeon Crusher: AFK HeroesUpdated
Also idle, combat
Collect heroes who clear dungeons without you, then log in to claim loot and assemble squads for PvP and PvE rankings.
75% idle
Endless Frontier - RPGUpdated
Also idle, combat
Lead a squad of knights and mages up thousands of stages against titans and dragons, with units that keep climbing and leveling on their own while you are away.
75% idle
Epic Stickman: RPG Idle WarUpdated
Also idle, combat
Guide a stickman hero through a shadowy realm, picking a class and gaining power in automatic fights even offline.
75% idle
Eternal Cannon Idle ShootingDormant
Also idle, tower defense
Defend a city with an upgradable cannon and walls, mixing tapping and upgrades where each level brings a new skill.
50% idle
F Class Adventurer: AFK RPGUpdated
Also idle, combat
Level a lowly F-rank adventurer toward S-rank with screen-clearing area skills while experience keeps piling up offline.
75% idle
Forge MasterDormant
Also idle, combat
Forge gear across eras from the Stone Age to the Quantum Age and battle other players on a leaderboard.

Fortress Saga: Idle AFK RPGUpdated
Also idle, combat
Collect heroes, clear dungeons, and upgrade a fortress in a fantasy idle RPG where your party keeps fighting and gathering rewards while you are offline.
75% idle