Games like NecroFarm
Games like NecroFarm include Plants vs. Zombies GOTY Edition, Plague Inc: Evolved, Kingdom Rush - Tower Defense, This War of Mine, and Bloons TD 6. We matched them by the tags players give NecroFarm on Steam (Action RTS, Simulation, Tower Defense, Farming Sim, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Singleplayer · Strategy

Plague Inc: Evolved
Shared: Simulation · Strategy · Singleplayer

Kingdom Rush - Tower Defense
Shared: Tower Defense · Singleplayer · Strategy

This War of Mine
Shared: Survival · Singleplayer · Simulation

Bloons TD 6
Shared: Tower Defense · Singleplayer · Strategy

Bee Island
Shared: Tower Defense · Action RTS · Strategy

They Are Billions
Shared: Tower Defense · Survival · Strategy

Dungeon Defenders
Shared: Tower Defense · Singleplayer · Survival

Farming Simulator 19
Shared: Simulation · Farming Sim · Singleplayer

Diplomacy is Not an Option
Shared: Action RTS · Zombies · Tower Defense

Age of Darkness: Final Stand
Shared: Action RTS · Tower Defense · Strategy

Stardew Valley
Shared: Farming Sim · Simulation · Agriculture

Thronefall
Shared: Tower Defense · Action RTS · Strategy

RimWorld
Shared: Survival · Simulation · Singleplayer

Totally Accurate Battle Simulator
Shared: Simulation · Singleplayer · Strategy

Frostpunk 2
Shared: Simulation · Survival · Strategy

Banished
Shared: Simulation · Survival · Strategy

Frostpunk
Shared: Survival · Strategy · Singleplayer

Coral Island
Shared: Farming Sim · Simulation · Singleplayer

Bloons TD 5
Shared: Tower Defense · Strategy · Singleplayer

911 Operator
Shared: Simulation · Singleplayer · Strategy

Cities: Skylines
Shared: Simulation · Singleplayer · Strategy

Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · Singleplayer · Strategy

Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · Singleplayer · Strategy