Chimera Protocol

The pitch

In a world where magic and machine merged into a corruption called the Living Rust, you are a Walker sent on an extraction mission into a fallen Sanctuary. Every run is a descent: the hordes thicken, time runs short, and a final boss eventually emerges. Surviving is no longer enough — you have to bring it down to extract.

Chimera Protocol takes the addictive Vampire Survivors loop (swarms, snowballing power, fast level-ups) and adds two hooks of its own. First, weapons that truly transform: when a weapon reaches its peak and meets the right passive module, it fuses into an evolved form — visually and mechanically different. Second, and this is the game's core idea: don't just kill the monsters — become them. Every kill fills an assimilation gauge tied to that enemy's archetype; fill it and you can graft a piece of the creature onto your own body. Your build doesn't just grow: it mutates, literally.

Gameplay loop

• Top-down survivor roguelite — move, kite the swarms, your weapons fire on their own.
• Dense bullet-heaven swarms — up to 300 enemies on screen, batch and wave spawning, with i-frames that make the hordes playable instead of punishing.
• 3-card level-ups — each level, pick one of 3 cards (new weapon, passive module, or fusion) and heal 25% of your max HP.
• Fusions that transform the weapon — max out a weapon while owning its required passive to unlock its evolved form. The Plasma Blade becomes a continuous fusion ring; the Impulse Cannon becomes a piercing rail; and more.
• Assimilation: become the chimera — every kill fills its archetype's gauge; a full gauge offers a graft (limited, replaceable slots). Two compatible grafts can fuse into a stronger form that frees up a slot — your own body is a third build axis, alongside levels and meta-upgrades.
• Endless-survival end-game — the timer counts down to the end-of-level boss. When it hits zero, the difficulty escalates hard: massive waves, mini-bosses and bosses on a loop. Beating the boss completes the level (unlocking the next) but the run keeps going — you survive as long as you can. Your survival time is the level's high score (with the difficulty it was set on).

Highlights

• A third progression axis: Assimilation. "Don't kill the monsters. Become them." Every enemy archetype (Swarm, Drone, Sentinel, Colossus) has its own gauge, filled by your kills; a full gauge offers a graft from a pool of 5 (Symbiotic Swarm, Erratic Servos, Aiming Eye, Grafted Carapace, Stalker's Wave). 3 slots by default, up to 5 through the Hub. Carry the right pair of grafts long enough and they fuse into an epic form that frees a slot — Armored Charge (your dash becomes an impact charge) or Turret Hive (your swarms become 4 auto-turrets covering 360°). A new Chimera codex screen on the main menu explains it all.
• 4 playable characters, each with their own stats, aura and signature weapon: Chimera (balanced cyborg, Impulse Cannon), Titan-Guardian (heavy robot, Drone Swarm), Wanderer (mobile human, Plasma Blade) and Vector (precision cyborg, Vector Lance — the only aimed starting weapon: you aim it yourself with the mouse or right stick, with an on-screen reticle, and the bolt pierces straight through every enemy in its path).
• 5 biomes with gameplay effects (not just cosmetic):
  • Rusted Sanctuary — neutral ground to learn the loop.
  • Aether Wastes — +20% XP, faster snowball.
  • Furnace — enemies +18% speed, for the reckless.
  • Cryogenic Frost — enemies −18% speed, room to kite and aim.
  • Neon Sector — an overclocked data sector: enemies +10% faster but +15% XP (risk vs reward).
• A build-craft arsenal — 12 weapons, 4 passives and 9 fusions to combine. Including a boomerang blade, homing missiles, a slowing cryo beam, a burning flame cone, an aimed vector lance, and an epic gravity-well singularity.
• A dedicated fauna per biome — each of the 5 biomes has its own creatures: rusted crawlers in the Sanctuary, spectral wraiths in the Aether Wastes, molten colossi in the Furnace, crystalline titans in the Frost, holographic glitches in the Neon Sector. 28 base enemies, each with its own sprite.
• Temporary power-ups — pick up timed buffs mid-run: Overclock (fire rate), Berserk (damage), Aegis (invulnerability), Celerity (speed). No permanent power-creep.
• Level progression — 5 levels unlock one after another (beat a level to unlock the next); each level tracks its best survival time + difficulty. A DEFEATED badge marks cleared levels.
• Weapon discovery — undiscovered weapons appear as ??? until you find them in a run.
• Reset everything — a one-click option to wipe all progress (Echoes, unlocks, records, discoveries) back to a fresh start.
• Adjustable difficulty — Easy / Normal / Hard (damage, HP and spawn rate scale accordingly).
• An escalating bestiary — 28 base enemies spread across the biomes, with elites carrying dangerous affixes (Armored, Regenerating, Explosive, Frenzied, Vampiric), 3 mini-bosses (Aether Revenant, Rust Stalker, Master Sentinel) and 1 final boss (the Rusted Core).
• Meta-progression — Aether Echoes earned in runs buy permanent upgrades at the Hub.
• Skippable narrative intro — the lore told in 5 beats on launch, skippable at any time.
• Keyboard or gamepad — arrow keys, ZQSD or your own layout: movement keys are fully rebindable in the Options, plus keyboard + gamepad navigation on every menu.
• Cyberpunk / CRT aesthetic — pseudo-3D shaded pixel art (fixed direction for depth), neon, scanlines, per-biome atmosphere (drifting fog, light shafts, parallax dust), a minimal Cyberpunk-2077-style HUD tinted per biome, screen shake, bloom and chromatic aberration on fusions.
• Built-in Codex — three screens browsable from the main menu: a Bestiary (each enemy's sprite, role and description), an Arsenal (12 weapons + 4 passives) and a Chimera screen (5 grafts + 2 fusions, effect and requirements).
• Localized in English, French and Spanish.

Setting

The Convergence changed everything.

When magic and machine intertwined, they birthed the Living Rust: a half-organic, half-mechanical corruption that devours the world and reanimates its husks. The Sanctuaries, last bastions, still hold Aether Cores — the only hope of pushing the Rust back. You are a Walker: a man/machine/magic fused fighter sent to extract from a fallen Sanctuary. Survive the Rust tides, harvest the Cores, and bring down what guards them before you extract. "One day, it will be you."

System requirements

• OS: Windows 10 / 11 (64-bit)
• Architecture: x86_64
• Runtime: none to install — .NET 8 is embedded in the build
• Engine: Godot 4.7 .NET (bundled in the .exe)
• Controls: keyboard or gamepad

The download contains ChimeraProtocol.exe AND the data_ChimeraProtocol_windows_x86_64/ runtime folder — both are required. They are bundled together in the provided ZIP.