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The Sentinel, the robot core you defend

A game byCodePulse Dev

MergeSentinel

Merge defenders around a robot core and hold it against alien waves that come from every side. The game is built for phones, also plays on desktop, and you can start right now in your browser.

Play in browser Playtest data

Live buildNo install, no account8 languages

Recorded in game

One run, four verbs

A run lasts from five minutes to an hour. Between runs, crystals buy permanent upgrades, so each attempt goes a few waves further.

  1. Buy

    Spend gold on new defenders. They land on a 5×5 grid around the Sentinel.

  2. Merge

    Drag two identical units together to create a stronger one. Levels 11 to 20 unlock deep into a run.

  3. Shape

    Pick boost cards and upgrade branches. Each unit type has its own paths, such as Twin, Mortar or Singularity.

  4. Survive

    The robot fights too. Tap an enemy to fire rockets, or tap the robot to release its eye laser.

Four zones

Every zone changes the rules of a run. Pick a cartridge to see it.

Deep Space zone, boss wave 15

Open the hatch

Every menu in the game is a service hatch on the robot. You unscrew an armor plate and tune the machine: permanent upgrades, unit skins and robot skins.

Portrait battle on a phone: Frost Fields, wave 37, the eye laser firing
Battle · phone
Upgrades hatch: damage, fire rate, crit and gold upgrades bought with crystals
Upgrades
Unit skins hatch: Classic, Gold, Frost, Inferno, Neon and Shadow skins
Unit skins
Robot skins hatch: Classic, Gold, Carbon and Sakura robots
Robot skins

Closed playtest

Volunteer testers played a separate test build and opted in to anonymous gameplay telemetry so we could balance the game. We read every run and rebalance from the numbers.

This is a small closed sample used to guide development. It is not a measure of a public audience. Raw logs and tester names are never published. The public build collects nothing; see the privacy policy.

External testers16+
Recorded runs25+
Days of telemetry6
Deepest wave in the logs142

How we build

We work in small playable steps. Every change goes to testers, the telemetry shows what happened, and the next build fixes it.

  1. Build

    Ship the next mechanic or fix as playable code, early.

  2. Test

    Hand builds to outside testers and watch real runs.

  3. Measure

    Read run telemetry and run bot simulations of waves, upgrades and outcomes.

  4. Iterate

    Rebalance, refactor and release the next build.

Built with Claude Code

Claude Code is the main engineering tool in the workflow. The developer sets the direction, makes the design decisions and reviews every change. The game was not generated autonomously.

  • Gameplay code
  • Debugging
  • Refactoring
  • Balance tooling
  • UI and icons
  • Localization
Phaser 3 · TypeScript · Vite Procedural art, no sprite sheets 96 commits since the repository opened on Oct 2, 2026 View the source on GitHub

Roadmap

  • Done

    • Playable web build for phones and desktop
    • 4 zones, 10 unit types, 20 levels
    • Permanent upgrades and skins
    • 8 languages
    • Closed playtest with telemetry

  • In progress

    • Balance and polish based on playtest data
    • Performance on low-end Android phones
    • Release on web game portals

Planned items are intentions, not committed release dates.

CodePulse Dev

We are an independent game studio. We write our own game code, design our own systems and test with real players. Merge Sentinel is our first game.

Feedback, press, collaboration contact@codepulse-dev.xyz Play Merge Sentinel