Neon survival roguelite

BULLET HEAVEN

Direct movement, auto-firing weapons, and a horde that never stops. Built around a deep 14-element reaction system where the combos emerge by design, not by a designer placing them.

Live demo — Milestone 1 core loopFullscreen ↗

Move with WASD or arrows. Weapons fire themselves. Collect gems, level up, survive. (Loads a WebAssembly build — give it a moment.)

Why it plays well

Easy to control. Deep to build.

The two halves of the genre, done together: the immediate, one-thumb control of Vampire Survivors with the transformative build-craft of Nova Drift.

One-stick control

360° movement on a single stick; every weapon auto-fires and auto-targets. Playable with one thumb on a phone, no aiming required.

Transformative builds

Upgrades don't just add numbers. Mods change how weapons behave, and evolutions transform them entirely. Two runs play completely differently.

Performance first

A deterministic, data-oriented core renders thousands of enemies and projectiles at a stable frame rate. Built for the densities a long run reaches.

The novelty engine

14 elements. 91 reactions.

Every weapon and effect speaks a shared language. Apply one element to build an aura and stacks; apply a second and trigger a reaction. The combinations are where the game lives.

FireColdLightningPoisonVoidAetherKineticLightDecayTimeSoundBloodPsychicNano

Cold aura + Lightning = Superconduct. Fire + Poison = Combustion. Cold + Sound = Shatter. Void + Aether = Paradox.
A 14×14 matrix of reactions, all tunable in the open Balance Bible.

Built in the open

The Balance Bible

Every weapon, enemy, mod, and elemental reaction in this game is designed and tuned in a live web tool — with computed DPS, time-to-kill, and the full reaction matrix. It's public. Poke at the numbers.

Open the Balance Bible →
Where it's going

Roadmap

Built deterministic from day one so co-op multiplayer can be layered on without a rewrite.

✓ Shipped

Milestone 1 — Core loop

  • Move, auto-fire, auto-target
  • Spawning enemies, spatial-hash collision
  • XP, level-up upgrade picker
  • Deterministic, headless-tested sim
◇ Later

Milestone 3 — Co-op

  • 2–32 player co-op multiplayer
  • Layered on the deterministic core
  • Ascension tiers, endless mode