Idle Defense: Cosmic TD
Starting Idle Defense: Cosmic TD…
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Idle Defense: Cosmic TD

Rui Codex

Idle Defense: Cosmic TD is an idle space tower defense game. Your battle station at the edge of the galaxy fires on its own, wave after wave: you choose the upgrades, place your Sentry and tap enemies for bonus damage, and your station keeps earning while you are away.

  • Sectors of 25 waves, each with its own sector boss, and a boss fight every 10th wave
  • Enemies come in through three breach gates: put your Sentry node on a gate and set it to Frost (slow) or Burn (damage over time)
  • 9 enemy types, from scouts, tanks and healers to kamikaze crawlers
  • Specialise your core as a Laser, Sniper, Frost or Tesla tower
  • Research, modules and relics from Common to Legendary
  • Ascend for Crystals that make every future run stronger
  • Offline earnings: your station keeps fighting while you are away
  • Available in 11 languages

Controls: mouse or touch. On desktop, Space pauses and the number keys 1-9 cast unlocked skills.

Made by Rui Codex.

Game details

Last Updated
October 21, 2026