Games like Combo Clash - Era Wars
Combo Clash - Era Wars. These games share the most with it, and each one says why.

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
Merge Gun: Shoot ZombieDormant
Also merge, combat
Combine identical guns into stronger ones and use them to hold off waves of zombies.

Idle ArmyUpdated
Also merge, combat
Merge soldiers into stronger units and push through waves of drones, ninjas and tanks.

Zombie Idle DefenseUpdated
Also tower defense, combat
Equip survivors with weapons and hold a defensive line against waves of zombies and bosses across post-apocalyptic levels.

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

Idle Kingdom DefenseDormant
Also 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, combat
Build a crusader settlement's farms and trade, then spend the income on an army and walls to hold off waves of attackers.

Mega Tower - Casual TD GameUpdated
Also tower defense, merge
Merge and modify towers in a sci-fi tower defense that fights on its own but lets you aim manually.
50% idle
Tower Defense: Lazy ApocalypseUpdated
Also tower defense, combat
Play a monster-slaying streamer holding off zombie waves, upgrading weapons while your hero keeps fighting when you are away.
75% idle
Harvest King: Farm Defense TDUpdated
Also tower defense, merge
Merge vegetable defenders on rotating farm slots and manage water to fend off enemy waves, with resources building up while you are away.
50% idle
Merge Kingdoms - Tower DefenseUpdated
Also tower defense, merge
Merge and place towers against thousands of waves, unlocking prestige mode at wave 600 and a final boss at wave 1000.
has ending
Grow Defense
Also tower defense, combat
Level a castle's weapons and skills to hold back monsters across zones, chase rare drops from raid bosses and rebirth for permanent perks.
77% steam
Idle Monster TD
Also tower defense, combat
Place elemental monsters on the map to hold off endless robot waves, combining their abilities and upgrading stats between fights.
72% steam70% idle
Tiny TowersUpdated
Also tower defense, combat
Defend a small fortress against waves of tiny monsters in an action-focused incremental.
4.1★ galaxy25% idle
Zero Stress King: Idle DefenseUpdated
Also tower defense
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
Unnamed Space Idle
Also combat
A ship, a sector map and a tidy prestige loop. Quietly one of Galaxy's most-played games.
92% steam4.5★ galaxy70% idle
Soda Dungeon
Also combat
Hire soda-fuelled adventurers from your tavern, send them into a deep dungeon on manual or auto combat, and spend loot on upgrades.
94% steam50% idle
Idle Hero TD - Tower Defense RPGUpdated
Also tower defense
An endless tower defense where you recruit and place fantasy heroes against infinite waves, and they keep fighting and collecting rewards while the game is closed.
82% steam75% idle
Lootun
Also combat
Send up to three adventurers into dungeons while you salvage, craft and enchant their loot, choosing from four classes with ascendancies.
94% steam50% idle
Desktop Defender
Also tower defense
A lone tower in the corner of your screen holds off waves while you work, dropping gear to equip and resetting runs for permanent ascension upgrades.
92% steam90% idle
Dark Hunting Ground
Also combat
A minimalist pixel action RPG about loot and builds, where farming shifts from hands-on to automated as you descend into the Void.
95% steam
Ancient Russian Life Simulator
Also combat
A meme-heavy clicker where ancient warriors fight lizards, learn absurd techniques from a skill tree and sacrifice their foes for blessings.
95% steam
Dragon Cliff
Also combat
A semi-idle party RPG built around deep itemization: 25 classes, talent trees, reforging, and battles that run on their own until you spend rage.
89% steam50% idle
DEFRAG
Also combat
Purge viruses from corrupted sectors, collect resources to strengthen and combine nodes, and try harder difficulties.
93% steam