Games like Streamlands: Defense
Games like Streamlands: Defense include Creeper World 4, Bloons TD 6, Broken Arrow, WARNO, and Bad North: Jotunn Edition. We matched them by the tags players give Streamlands: Defense on Steam (Strategy, Top-Down, Tower Defense, 3D, and Casual): closest matches first, and among equally close ones the better-known games.

Creeper World 4
Shared: Tower Defense · Strategy · Wargame

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Broken Arrow
Shared: Strategy · Wargame · War

WARNO
Shared: Strategy · Wargame · War

Bad North: Jotunn Edition
Shared: Tower Defense · Wargame · Real Time Tactics

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

Company of Heroes 3
Shared: Strategy · Wargame · RTS

Warpips
Shared: Strategy · Tower Defense · War

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

Commandos: Origins
Shared: Strategy · 3D · Top-Down

Minimalist Tower Defense
Shared: Strategy · Tower Defense · Top-Down

Company of Heroes 2
Shared: Strategy · War · RTS

Wargame: Red Dragon
Shared: Strategy · Wargame · RTS

Last Train Home
Shared: Strategy · RTS · War

Age of History 3
Shared: Strategy · Wargame · RTS

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · Real Time Tactics · War

Sudden Strike 4
Shared: Strategy · RTS · War

Hearts of Iron IV
Shared: Strategy · War · World War II

Kingdom Heroes 8
Shared: Strategy · War · RTS

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

Mechabellum
Shared: Strategy · Auto Battler · Wargame

Foxhole
Shared: Wargame · Top-Down · Strategy

Stickman Trenches
Shared: Strategy · Wargame · Casual

Total War: WARHAMMER III
Shared: Strategy · War · RTS