EMBERWING — Volcanic Flap

A single-page, 100% offline Flappy-Bird-style arcade game set in a living volcanic world. Pick your heat, choose your bird, hold to flap, and dodge basalt rifts that drift, breathe, and sway.

Zero assets, zero dependencies at runtime — every pixel is drawn procedurally on <canvas> and every sound is synthesized live with WebAudio. The production build is one self-contained index.html that runs over http(s) or straight from disk (file://), forever.

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▶ Play it instantly

Way	How
From disk	Just double-click index.html — it is the complete game. Works offline, no build, no server
Dev server	npm install && npm run dev

Controls

Input	Action
Space / ↑ / W / click / tap	Flap — hold to auto-flap
P or Esc	Pause (auto-pauses when the tab loses focus)
M	Mute / unmute
T	Cycle world theme
S	Cycle bird
1 2 3	Pick heat level

Features

Three heat levels — each with its own physics, spacing, and its own best score:

• WARMING — floaty gravity, wide gaps, fat pillars. A gentle warm-up.
• STANDARD — the classic burn. Pipes start drifting at 18 pts, gaps tighten after 12, rifts begin to breathe at 15, and whole obstacles start to sway at 25.
• CRAZY — deceptively calm at first, then erupts: stick-thin to monstrosity-fat random pipes, chaotic spacing, breathing gaps and swaying pairs from the first minutes.

Escalating chaos — speed ramps every point (with velocity toasts), spawn rhythm and pipe widths randomize as you score, and drifting pipes wake up almost frozen before slowly turning restless. Amplitude, pace and range all grow with your score — always clamped so the game stays fair.

SPICY mode — a checkbox that sets the heat cards on fire, smolders the arena frame, and makes your bird burn with rage. Spacing, widths and gap sizes get far wilder, and the hostile environment wakes at half the normal threshold.

Four birds that differ in every dimension, not just color:

Bird	Feel	Body	Signature
EMBER	Balanced	Classic round	Flame tail · springy fwip-boing
FROSTWING	Floaty	Chubby, slow wingbeats	Crystal tail · makes it snow in any world · glass-shatter death
VOLT	Zippy	Slim, fast cadence	Lightning tail + arcs · electric zap-zip · short-circuit death
ONYX	Heavy	Big & wide, bends nearby embers into its void	Smoke trail · ground shadow · funeral-gong death

Each bird has its own gravity, flap strength, auto-flap rhythm, rotation lag, hitbox, funny flap voice and funnier death cry (sad trombones included).

Three worlds, each repainting the environment and the whole UI, with its own menu ambience:

• EMBER — volcanic dusk, magma veins, bubbling lava, rising embers, low rumble with distant booms.
• FROST — arctic dusk, falling snow, frozen shard-floor, cold fog, airy wind with sparse chimes.
• NEON — cyberpunk skyline, data-rain, circuit-grid energy floor, synth-hum ambience.

Game feel & furniture — screen shake, hit-flash, particle bursts, score boings whose pitch climbs as you survive, milestone toasts (THE RIFTS BREATHE!, THE STONE SWAYS!), medals (Bronze → Platinum), per-heat best scores persisted in localStorage, themed pause / game-over screens, and a built-in load-failure reporter so the page never dies silently.

Architecture

index.html          ← the game. Inline CSS + JS, canvas renderer, WebAudio SFX.
                      Build output (dist/index.html) is this same self-contained file.
src/                ← safe pipeline stubs so `npm run build` always succeeds
banner.svg          ← this README's key art

Why one file? The game was engineered to survive anything: no module scripts, no CDN fonts, no fetches — so it runs in any browser, from any origin (including file://), even decades from now. Fonts are a deliberately crafted system stack (Impact / Arial Black display + Trebuchet MS body) chosen to need no downloads.

Tech

• Vanilla TypeScript-grade JavaScript on a single <canvas> (devicePixelRatio-aware, requestAnimationFrame loop, clamped dt)
• WebAudio synthesis for every SFX and the themed ambience beds
• Responsive layout: full-bleed portrait on phones, framed portrait on tablets, wide 16:10 arena on desktop

The game is live at https://nimabhk.github.io/flappy-bird-extra and playable from any device.

License

Personal project — do whatever you like with it. A star ⭐ and a credit are appreciated.