Codex Mortis Storming Steam: Grolaf's 100% AI-Vibe-Coded Necromantic Bullet Hell — Code, Art, Sound All Generated, Free Demo Live for the Slop Apocalypse
Category: Usage Scenarios
Excerpt:
Indie dev Grolaf (aka Crunchfest3) dropped the Codex Mortis demo on Steam December 9, 2025 — billed as the world's first fully playable game created 100% through AI, from vibe-coded TypeScript logic to ChatGPT-spawned pixel art and shader-wobbled animations. This Vampire Survivors-esque roguelite packs infinite dark magic builds, undead army commands, and co-op chaos across procedural hellscapes, all forged in three months without a single game engine. Mixed reviews (54% positive) hail the feat while roasting the "slop," but the free demo's already sparking AI game dev Armageddon.
CODEX MORTIS: The AI-Vibe-Coded Bullet Hell Roguelite Shuffles Onto Steam
The AI slop singularity just got Steam-verified — and it's undead, overpowered, and oddly addictive. Codex Mortis isn't some half-baked prototype; it's a full-throated declaration that one dev + generative gods can birth a bullet hell roguelite from pure prompts.
Grolaf's three-month odyssey skipped Unity/Unreal entirely, vibe-coding the core in TypeScript with PIXI.js rendering, bitECS entity systems, and Electron packaging — all iterated via Claude Code (Opus 4.1/4.5) and regular ChatGPT for art that "remembered" its gothic vibe across sessions.
Sounds? AI-orchestrated dirges. Animations? Shader hacks when sprite rigging ghosted. The result: a necromantic survival frenzy where Death is your arsenal, playable solo or local co-op, now demo'd for free on Steam with 56 achievements and mixed rage-love (54% positive from 33 reviews).
🧟 Vibe-Coded Necromancy: The Build Blender
Prompt your way to apocalypse with five dark magic schools for infinite synergies:
| Magic School | Core Powers |
|---|---|
| Necromancy | Bone spears, corpse detonations, skeletal prisons — turn kills into killstreaks. |
| Summoning | Raise undead hordes and bone golems to swarm the screen. |
| Blood Magic | Sacrifice squad life for nukes; pair with Necro for burning blasts. |
| Soul Magic | Harvest essences, phase through bullets like a ghost boss. |
| Curses | Shatter enemy minds, spread terror — undead legions trap the terrified. |
Game Modes to Die For
- Escape: Outrun the immortal hunter Lothar through procedural worlds.
- Challenge: Grind bosses for rare artifacts and broken builds.
- Eternal: Embrace pure power creep — no limits, just endless undead chaos.
- Local Co-op: Amplify the corpse confetti with friends.
Pre-mission: Assemble death squads, equip artifacts, theory-craft builds. In-run: Detonate, command, explode — bullet-hell ballet at its goriest.
⚰️ The Interface of Inevitable Doom
Boot the demo: A slick Electron wrapper feels native, with controller support (Xbox partial) and deep progression systems that upgrade cooldowns, damage, and speed. Canvas-style mission prep morphs into chaotic combat — drag heroes, mix spells, and watch synergies shred skeletons.
Grolaf’s secret? Prompts like “Maintain gothic consistency” kept AI art from devolving into rainbow vomit. Exports? Pure streamer bait, with Steam Cloud syncing your sloppiest (and most overpowered) builds.
📊 Launch Metrics: Hype, Hate, and Headshots
- Demo Detonation: Live since Dec 9 — 140MB download, runs on potatoes (i3/GTX 650 min). 33 Steam reviews (mixed) praise its “free fun” while critics blast “AI garbage” — perfect rage bait.
- Reddit Rampage: r/aigamedev lit up with Grolaf’s postmortem; Steam forums debate “slippery slope” vs. “why the butthurt?”
- Playtest Punch: Procedural runs stay fresh; co-op hits Vampire Survivors highs, but shader wobbles and “slop vibes” fuel the chaos.
🛡️ The Slop Safeguards (Kinda)
Grolaf owns the beta blues: No engine meant Steam integration headaches (Tauri flopped), animations were shader-faked for sanity. Ethical? Transparent AI badges, no deepfake pretenses — just a “vibe-coded” proof-of-concept that “feels less mentally draining than traditional dev.” Community forks? Teased on Reddit, incoming soon.
🕸️ Game Dev’s Grim Reaper
This mic drop buries the “AI can’t make games” myth: While AAA hoards engines, solos like Grolaf flood Steam with prompt-forged chaos. Vampire Survivors clones? Sure — but 100% AI amps the existential dread. Expect copycats vibe-coding roguelites by Q1 2026: Will it dilute dev jobs… or democratize dreams?
Codex Mortis isn’t pinnacle art — it’s the proof-of-principle Molotov for AI game dev, torching three-month pipelines into prompt infernos. As Grolaf’s undead demo shambles across Steam, it screams: Humans prompt, AIs play God, and gamers decide if slop’s the future or just the vibe.
The bullet hell’s begun — grab your necromancer and join the resurrection.
