Pulloseum (풀로세움)

No install, no build, no sign-up — it runs entirely in the browser and saves to local storage. The whole game (code + data) is one index.html.

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What it is

Pulloseum is a browser game where you explore alien planets, collect plant seeds, raise them through six growth stages, and battle them in a Pokémon-style turn-based tournament. It blends three genres:

• Idle / incremental — plants grow and bear fruit over real time.
• Turn-based tactical battle — a Clash-Royale-style loadout of skills, elemental type matchups, status effects (poison / burn / bleed / buffs), and mutation cards.
• Collection & breeding — 170+ species and variants with procedurally drawn art, rarity, traits, and a living in-game codex (Pokédex).

It ships as one index.html (~15,000 lines of vanilla HTML/CSS/JS, no framework), plus a PWA service worker and a Capacitor Android wrapper for mobile.

Why I built it

I wanted to see how far a single-file, dependency-free, deterministic game could go — a game that anyone can open by double-clicking one HTML file, that has no build step and no runtime dependencies, yet still supports a deep battle engine, hundreds of creatures, and offline play. It started as a personal project and is developed fully in the open.

Features

• Exploration — an orbital star map (11 planets / 4 orbits) with per-region species distribution, ship upgrades, and fold-travel encounters.
• Growth & nurture — 6 growth stages, an idle fruit/harvest loop, and collectible pots that modify growth speed and reward tiers.
• Battle — 1v1 tournaments (primary) and 3v3 team leagues with a shared energy pool, 6-skill loadouts, a separate mutation-card bar, deterministic combat resolution, and a bot AI with archetype-driven behavior and telegraphed big moves.
• Species & skills — 170+ species/variants, 6 mutation forms (weapon / predator / toxin / spore / dragon / normal), per-individual signature skills, and 20 traits.
• Mission / story mode — authored campaigns with deterministic boss gimmicks.
• Procedural plant art — creatures are drawn as composed SVGs (composePlantSvg), with drop-in PNG sprite overrides for hand-drawn art.
• Korean localization — automatic Korean particle (josa) handling for dynamic names.
• Offline-first — PWA + local-storage saves; installable, and packaged for Android via Capacitor.

Run it

Easiest: double-click index.html — the whole game (code + data) is inlined, so it runs with no server and no dependencies.

Local server (optional):

powershell -NoProfile -ExecutionPolicy Bypass -File .claude/serve.ps1 -Port 8765
# → http://localhost:8765

Android build: see docs/android-capacitor-wrapper.md.

There is no build step. Everything is plain HTML/CSS/JS.

Project structure

Path	What it is
index.html	The entire game — CSS, JS, and game data are all inlined.
docs/master-roadmap.md	Single source of truth for status, direction, and design docs.
docs/	Design specs, battle/species guides, changelog, balance sheet.
scripts/	Node generators for species/skills/variant data (idempotent).
tools/	No-install, browser-based dev utilities (e.g. sprite prep).
assets/, data/	Sprites and reference data.
android/	Capacitor Android wrapper.

Roadmap & maintenance

Active direction lives in docs/master-roadmap.md (the single hub). Near-term goals include more species, a pixel-art UI pass, animation/sound, server- authoritative PvP, and a Google Play release. Development happens in the open with a documented per-change discipline (code and docs are committed together).

Tech

Vanilla HTML / CSS / JavaScript · PWA (service worker) · Capacitor (Android) · Node scripts for data generation. No framework, no bundler.

Author

Built and maintained by @promuzi.

License

See LICENSE.