Games like XENO SIEGE
Games like XENO SIEGE include Bloons TD 6, Rogue Tower, Cluckmech Oasis, Plants vs. Zombies GOTY Edition, and Apocalypse Party. We matched them by the tags players give XENO SIEGE on Steam (Casual, Strategy, RPG, Action Roguelike, and RTS): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Rogue Tower
Shared: Strategy · Casual · Tower Defense

Cluckmech Oasis
Shared: Strategy · Tower Defense · Roguelike

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

Apocalypse Party
Shared: Casual · Action Roguelike · Top-Down Shooter

Total War: WARHAMMER
Shared: Strategy · RPG · RTS

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · RPG · Strategy

Pass the Fear
Shared: Action Roguelike · Strategy · Roguelike

Dungeon of the ENDLESS™
Shared: Strategy · RPG · Tower Defense

Goobies
Shared: Action Roguelike · Casual · Top-Down Shooter

Vampire Survivors
Shared: Action Roguelike · Casual · Roguelike

Creeper World 4
Shared: Tower Defense · Strategy · RTS

Tower Dominion
Shared: Strategy · Tower Defense · RTS

Bardbarian
Shared: Strategy · Casual · RPG

Wedding Witch
Shared: Action Roguelike · Casual · Roguelike

The King is Watching
Shared: RTS · Tower Defense · Strategy

Touhou Monster TD ~ 幻想乡妖怪塔防
Shared: RPG · Tower Defense · RTS

Lumencraft
Shared: Strategy · Action Roguelike · Tower Defense

Freeman: Guerrilla Warfare
Shared: Strategy · RPG · Shooter

Brotato
Shared: Action Roguelike · Roguelike · RPG

Drifter Star: Evolution
Shared: Casual · Strategy · RPG

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

Crab Champions
Shared: Action Roguelike · Roguelike · Casual

Blazing Beaks
Shared: Action Roguelike · Roguelike · Shooter