Games like Wartide
Games like Wartide include Sir, We Have an Orc Problem, Shelldiver, Zero Stress King: Idle Defense, Call to Arms, and Desktop Defender. We matched them by the tags players give Wartide on Steam (Desktop Companion, Action, Tower Defense, Military, and War): closest matches first, and among equally close ones the better-known games.

Sir, We Have an Orc Problem
Shared: Tower Defense · War · Military

Shelldiver
Shared: Incremental · Casual · Resource Management

Zero Stress King: Idle Defense
Shared: Tower Defense · Strategy · Idler

Call to Arms
Shared: Action · Military · Strategy

Desktop Defender
Shared: Desktop Companion · Tower Defense · Incremental

Arma 3
Shared: Action · Military · War

Starship Troopers: Terran Command
Shared: Strategy · Military · War

Firestone – Idle Clicker Online RPG
Shared: Incremental · Idler · Action

Men of War: Assault Squad 2
Shared: Strategy · War · Action

Bongo Cat
Shared: Desktop Companion · Idler · Casual

Total War: THREE KINGDOMS
Shared: Strategy · War · Military

Arma Reforger
Shared: Military · Action · Strategy

Thronefall
Shared: Tower Defense · Action · Strategy

Bills Must Be Paid
Shared: Incremental · Strategy · Idler

Chef Knight
Shared: Strategy · Incremental · Casual

Squad
Shared: Military · Action · PvE

Hell Let Loose: Vietnam
Shared: Action · Strategy · Military

Northend Tower Defense
Shared: Tower Defense · Strategy · War

Bloons TD 5
Shared: Tower Defense · Action · Strategy

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

Call of Duty®
Shared: Action · Military · War

Idle Champions of the Forgotten Realms
Shared: Strategy · Idler · Incremental

Hearts of Iron IV
Shared: Strategy · War · Military

Ravenfield
Shared: War · Military · Action