Voidfall

Neon roguelight survivor - survive waves, craft builds, master the void

Godot 4.6 GDScript Codeplain

Encode Vibe Coding Hackathon 2026

A Proven Genre With Room for Innovation

Roguelite survivors have repeatedly become breakout indie hits.

Vampire Survivors

27M+

players worldwide

Brotato

10M+

players · Godot · 96% Steam

DRG: Survivor

1M

copies in <1 month EA

Binding of Isaac

10M+

copies · roguelite pioneer

The gap: Most survivors are fantasy or medieval. Voidfall targets neon sci-fi, environmental hazards, and 6-player Steam co-op.

A proven loop with a distinct identity and a broader audience.

Sources: Steam review data, Poncle, Funday Games, Wikipedia (2024–2026)

What Is Voidfall?

A neon roguelight survival shooter - fast runs, deep builds, lasting progression.

  • Top-down auto-fire combat in a neon-lit void - dodge threats, survive escalating waves
  • Environmental hazards reshape each arena (storms, anomalies, distortion fields)
  • Mid-run buildcraft: 8 stats, 8 modules, and 4 systems from supply drops
  • Void Shards unlock new fighters between runs; solo save/continue or Steam co-op (up to 6)

Roguelight structure with survivor pacing - solo or with up to five friends.

Core Gameplay Loop

  • Each wave: fight → collect XP & supply drops → choose upgrades
  • Between runs: earn Void Shards, unlock fighters, start stronger
Choose Fighter Fight Waves Collect XP & Drops Upgrades Hazards Bosses Void Shards Unlock Fighters Start Stronger
~15 mintypical run
8+8+4stats · modules · systems
Every 5waves → boss

Fast sessions, meaningful choices, permanent progression.

Key Features

6-player Steam co-op Environmental hazards Boss every 5 waves Void Shards + save/continue

8 XP Stats

+
Vitality
»
Thrusters
✦
Rapid Fire
◎
Atk Range
→
Reach
★
Fortune
⬡
Lifesteal
◆
Plating

8 Modules

⊙
Magnet
▲
Shardheart
▼
Bloodrage
↻
Seeker
⋔
Forked
◇
Hoarder
✱
Blast
ϟ
Storm

4 Systems

➤
Jetpack
⊚
Anti-Grav
◐
Chronos
⊕
Turret

Every run layers stats, modules, and systems into a unique build.

Codeplain as a Development Multiplier

  • Game behavior was authored with Plain Forge universal skills in OpenCode and Grok Code
  • Those agents iteratively built and refined voidfall.plain - specs as the source of truth
  • codeplain rendered specs into a playable Godot project in dist/
  • Hackathon deliverable: combat, upgrades, waves, bosses, and co-op — rendered from specs, not hand-edited GDScript
  • As voidfall.plain grew, we hit complexity limits — some functional specs became too large to render and needed rework
OpenCode + Grok Code
→
Plain Forge skills
→
voidfall.plain
→
codeplain
→
dist/ Godot

Next step: split the game into dedicated .plain modules (combat, UI, meta-progression) linked via requires

Specs accelerated the hackathon build — modular specs are the next step.

Hackathon Deliverables - Playable Today

  • Playable Windows export from dist/project.godot
  • 3 fighters with unique passives and techniques
  • Wave spawning, XP upgrades, supply drops (stats / modules / systems)
  • Boss every 5 waves
  • Environmental hazards — storms, anomalies, distortion fields
  • Solo save/continue between waves
  • Steam lobby co-op (up to 6 players)
  • Logbook, build simulator, Void Shard meta progression

Not a slide deck about a game - a game you can run right now.

Designed to Become a Real Product

  • Replayable runs and build variety drive session length and return rates
  • Co-op creates social retention and word-of-mouth growth
  • Content scales through fighters, enemies, modules, bosses, and cosmetics
  • Built in Godot 4.6 - same engine as Brotato (10M+ players, 96% Steam)
  • Steam Early Access validates retention before full launch
  • Release targets: PC (Steam), Nintendo Switch, Google Play, and Apple App Store

Voidfall vs. typical survivor

6-player Steam co-opSolo or 2-player max
Environmental hazardsFlat arenas
Neon sci-fi voidFantasy / medieval
Spec-driven (Codeplain)Hand-coded iteration
Steam Nintendo Switch Google Play App Store

A genre with proven demand - built for PC first, designed to scale to console and mobile.

From Hackathon Prototype to Multi-Platform Release

1

Hackathon Prototype

Playable core loop, combat, waves, upgrades, co-op foundation

2

Polishing Now

Balance pass, UX polish, performance, content expansion

3

Steam Early Access

Steam PC launch, feedback loop, retention metrics

4

Full Release

Full Steam PC launch - achievements, game modes, content roster

5

Cross-Platform

Google Play, Apple App Store, and Nintendo Switch - ports after PC validation

Why We Fit Both Challenges

Codeplain Bounty - Best Project Built With Codeplain

  • Plain Forge skills in OpenCode and Grok Code authored voidfall.plain; codeplain rendered to dist/
  • Delivered a co-op-capable prototype within hackathon scope
  • Spec-driven architecture reduced debugging and rework
  • More features shipped - iteration was render-and-test, not hand-edit

Solvimon Bounty - Most Likely to Be a Successful Business

  • Genre comps (Vampire Survivors, Brotato) validate market demand
  • 6-player co-op differentiates from solo-only survivors
  • Replayable buildcraft supports long-term engagement
  • Clear path: Steam PC → Google Play, App Store, and Nintendo Switch

Voidfall shows how AI-assisted development can turn a hackathon idea into the foundation for a commercially viable cross-platform game.

Voidfall

Survive the void. Evolve the run.

Hackathon 2026 - Thomas Pöhlmann · Laurin Wittich · Celvin Kuhn · Lucas Härtel

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