GameHub Official

Prismkeep

Prismkeep: Idle Tower Defense

Idle tower defense that keeps fighting while you're offline. No paywalls.

  • Idle while offline
  • 13 upgrades per run
  • 8 strata
  • No paywalls
  • Plays offline
Coming soonDetails

Coming soon to Google Play

Prismkeep: idle tower defense. Keeps fighting while you're offline. A faceted crystal prism inside a dashed range ring, approached by geometric shapes.

About the game

Prismkeep is a minimalist idle tower defense game. A faceted crystal Prism stands at the centre of the night sky while waves of geometric shapes march in from every side. It fires on its own, and you decide how it grows.

Close the app and your run keeps going: every wave you miss is resolved from your Prism’s real strength, and you come back to a clear report of time away, waves cleared, and Lumens and Glint earned. Nothing runs in the background, so there is no need to leave your screen on. There is nothing to buy, ads never appear during battle, and the game plays fully offline.

Screenshots

  • Prismkeep screenshot: Keeps fighting while you're offline Come back to a clear report
  • Prismkeep screenshot: Shapes vs. a crystal Prism Waves march in from every side
  • Prismkeep screenshot: 13 upgrades every run Attack, Defense and Utility
  • Prismkeep screenshot: Permanent Foundry upgrades They apply to every run
  • Prismkeep screenshot: Studies, Lenses, Foundry Studies progress while the app is closed
  • Prismkeep screenshot: Five Lenses to equip Burn, frost, echo, aegis, prospecting
  • Prismkeep screenshot: Daily missions and streaks New missions every day
  • Prismkeep screenshot: No paywalls. No ads in battle. Eight strata to conquer

Key features

  • Truly idle

    Your run keeps going while the app is closed, with a welcome-back report when you return. Auto-Tune keeps upgrading while you are away, and Rekindle starts a new run if your Prism falls.

  • 13 Tuning upgrades every run

    Attack, Defense and Utility upgrades: beam power, fire rate, range, flares, split beams, integrity, mending, armor, Nova bursts and more.

  • Foundry, Observatory and Lenses

    Permanent Foundry upgrades, timed Observatory studies that progress online or offline, and five Lenses: burning beams, frost, echo shots, aegis armor and prospecting.

  • 8 strata of rising difficulty

    Monolith bosses every 10 waves and milestone rewards every 25 waves. Reach wave 60 to unlock the next stratum.

  • Fair by design

    No paywalls: there is nothing to buy, and every upgrade is earned by playing. Optional rewarded ads double your Lumens or idle earnings if you want.

  • No ads during battle

    Ads appear only on menus, after some runs end, or when you choose to watch one. Never during battle.

  • Made for everyone

    Every enemy has its own silhouette (triangle, square, diamond, hexagon, octagon), so you never rely on colour alone. Reduce motion, scientific notation, battery saver and readable big numbers.

  • Missions and achievements

    Three daily missions, streaks, 21 achievements and detailed stats. Plays fully offline.

Details

Platform
Android
Genre
Strategy
Availability
Coming soon to Google Play
Package
com.prismkeep.idle
Release date
Not announced yet
Developer
GameHub Official

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