Games like Silent Frontiers
Games like Silent Frontiers include Plants vs. Zombies GOTY Edition, Kingdom Two Crowns, Thronefall, Minimalist Tower Defense, and Bloons TD 6. We matched them by the tags players give Silent Frontiers on Steam (Strategy, 2D Platformer, Wargame, Tower Defense, and 2D): closest matches first, and among equally close ones the better-known games.

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Minimalist

Thronefall
Shared: Strategy · Tower Defense · Minimalist

Minimalist Tower Defense
Shared: Strategy · Tower Defense · 2D

Bloons TD 6
Shared: Strategy · Tower Defense · 2D

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · 2D

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · 2D

Age of Darkness: Final Stand
Shared: Strategy · Tower Defense · Base Building

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Tower Defense · 2D

Bad North: Jotunn Edition
Shared: Wargame · Tower Defense · Minimalist

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · 2D

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D

Mindustry
Shared: Tower Defense · Strategy · Base Building

Oxygen Not Included
Shared: Base Building · 2D · Strategy

They Are Billions
Shared: Strategy · Base Building · Tower Defense

Factorio
Shared: Strategy · Base Building · 2D

Rogue Tower
Shared: Strategy · Tower Defense · Base Building

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · 2D

Rise to Ruins
Shared: Strategy · Tower Defense · Base Building

RimWorld
Shared: Strategy · Base Building · Survival

The King is Watching
Shared: Tower Defense · Strategy · Base Building

Grim Nights
Shared: Strategy · Tower Defense · 2D

Nubby's Number Factory
Shared: Strategy · Psychological Horror · 2D

Kingdom: New Lands
Shared: Tower Defense · Base Building · Strategy