Games like Harvest King: Farm Defense TD
Harvest King: Farm Defense TD balanced. These games share the most with it, and each one says why.

Mega Tower - Casual TD GameUpdated
Also tower defense, merge · Same active/idle balance (balanced)
Merge and modify towers in a sci-fi tower defense that fights on its own but lets you aim manually.
50% idle
Idle Farm Tycoon - Merge GameUpdated
Also merge, farming
Run a farm by merging workers, transporters and crops into stronger versions, and level up managers to boost income.
75% idle
Plantera 2: Golden Acorn
Also farming · Same active/idle balance (balanced)
Grow a garden around a magic oak with round helpers who harvest for you, even while the game is closed, and reach for golden acorns.
95% steam50% idle
Plantera
Also farming · Same active/idle balance (balanced)
Grow a garden of crops, trees and animals while round helpers harvest for you, and keep earning even with the game shut.
89% steam50% idle
Combo Clash - Era WarsUpdated
Also merge, tower defense
Merge weapon blocks on a grid to power a hero against waves of enemies, advancing through eras from cavemen to future soldiers.

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
Your Big, Cute Monster Farm
Also farming, merge
A farm along the bottom of your screen where monster helpers till, plant and harvest on their own while you arrange plots, hatch new workers and merge abilities.
78% steam90% idle
Game of Grass
Also farming · Same active/idle balance (balanced)
Mow your lawn with increasingly silly tools to prove it beats your neighbor's, grow crops for passive income and prestige for new abilities.
84% steam50% idle
The Board is YoursUpdated
Also planning · Same active/idle balance (balanced)
Buy chess squares and pieces and position them so defended pieces boost each other's output, with prestige perks that change your strategy.
97% steam4.2★ galaxy50% idle
The Tower - Idle Tower DefenseUpdated
Also tower defense · Same active/idle balance (balanced)
Defend a single tower against waves, buy permanent upgrades and research while idle or active.
50% idle
Food Evolution - Clicker GameDormant
Also merge · Same active/idle balance (balanced)
Drag matching foods together to mutate them into weird creatures that earn coins, including while you are offline.
50% idle
Eternal Cannon Idle ShootingDormant
Also tower defense · Same active/idle balance (balanced)
Defend a city with an upgradable cannon and walls, mixing tapping and upgrades where each level brings a new skill.
50% idle
Idle Sheep!Dormant
Also farming · Same active/idle balance (balanced)
Tap to build a farm of sheep, cows and pigs, researching upgrades while it keeps earning when you are not playing.
50% idle
refarm
Also farming · Same active/idle balance (balanced)
Raise sunken tiles from the sea one at a time, farming each to fund more land and unlocking basic helpers. A short, click-heavy run of about two hours.
87% steamhas ending50% idle
Grid Forge TDUpdated
Also tower defense, planning
Tower defense where you lay tetromino pieces to shape the enemy path and mount towers on them.
3.5★ galaxy
A Dungeon Is You - DemoUpdated
Also tower defense, planning
Reincarnated as a dungeon core, you lay out a maze of walls and floors, upgrade defenders and fit loot idols into a grid inventory.
2.8★ galaxy
The Perfect Tower II
Also tower defense · Same active/idle balance (leans idle)
Tower defence as an idle engine, plus factories, mining and an in-game scripting language.
87% steam60% idle
Samawa Idle
Also tower defense · Same active/idle balance (balanced)
Pick and level towers against monster hordes, shaping runs with random gear, passives and a skill tree across two prestige layers.
68% steam50% idle
Farmtale
Also farming · Same active/idle balance (balanced)
Start an island farm with one chicken, then add crops, animals and hired workers, decorate buildings, and explore as upgrades pile up. Part idle, part clicker.
68% steam50% idle
Increlution
Also planning · Same active/idle balance (leans idle)
Live a life, die, and carry your skills into the next one. Queue-based planning with a proper story and a finish line.
85% steam40–100h ending60% idle
Farmer Against Potatoes Idle
Also farming
A farmer at war with sentient potatoes, and approximately forty interlocking upgrade screens.
95% steam70% idle
Stuck In Time
Also planning
Plan action lists for each time loop, let them run, and refine routes through a pixel-art world as you work toward escape.
85% steamhas ending70% 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
Tiny TerracesUpdated
Also farming
Tiny workers water, weed and harvest a terrace garden on their own while you do other things. Use crops and parts to build more helpers and decorate the plot.
92% steam90% idle