Games like Swarm Survivor: Endless Siege
Games like Swarm Survivor: Endless Siege include Desktop Defender, Cookie Clicker, Nova Drift, Megabonk, and 20 Minutes Till Dawn. We matched them by the tags players give Swarm Survivor: Endless Siege on Steam (Idler, Tower Defense, Bullet Heaven, Desktop Companion, and Incremental): closest matches first, and among equally close ones the better-known games.

Desktop Defender
Shared: Idler · Desktop Companion · Tower Defense

Cookie Clicker
Shared: Idler · Incremental · Casual

Nova Drift
Shared: Shoot 'Em Up · Roguelite · Bullet Hell

Megabonk
Shared: Bullet Heaven · Roguelite · Bullet Hell

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

Bills Must Be Paid
Shared: Incremental · Idler · Roguelite

Necrosmith
Shared: Tower Defense · Roguelite · Bullet Hell

Dragon Cliff
Shared: Idler · Incremental · Strategy

Astro Prospector
Shared: Incremental · Bullet Heaven · Roguelite

Death Must Die
Shared: Bullet Heaven · Roguelite · Bullet Hell

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

(the) Gnorp Apologue
Shared: Idler · Incremental · Roguelite

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Roguelite · Bullet Hell

最后的仙门 The last Practice Sect
Shared: Idler · Tower Defense · Incremental

Heretic's Fork
Shared: Bullet Heaven · Tower Defense · Strategy

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

Sir, We Have an Orc Problem
Shared: Tower Defense · Incremental · Roguelite

Samawa Idle
Shared: Idler · Incremental · Tower Defense

Nodebuster
Shared: Idler · Incremental · Strategy

Time Wasters
Shared: Bullet Heaven · Bullet Hell · Roguelite

Deskrawl: Idle ARPG
Shared: Idler · Desktop Companion · Incremental

Maktala: Slime Lootfest
Shared: Idler · Incremental · Roguelite

Soulstone Survivors
Shared: Bullet Heaven · Roguelite · Bullet Hell

Void Miner – Incremental Asteroids Roguelite
Shared: Incremental · Roguelite · Bullet Hell