Limbo-parody 2D physics puzzle-platformer (Canvas + Matter.js, single file) — Iterations 1–6

[ilikevibecoding]

Limbo-parody physics puzzle-platformer — single-file Canvas + Matter.js demo

A transformative parody demo of Limbo's opening forest: monochrome silhouette aesthetic, fixed-timestep Matter.js physics, eight physics puzzle beats across a 13,700-unit forest, all in one index.html with zero build steps and procedural drawing only.

Iteration 6 — mid zoom, five new stages, light poles, reactive grass, drowning rework

• Camera: base zoom dialed to ~1.6× (between the close-up and wide checkpoints, boy ≈ 1/9 screen height); the camera smoothly zooms out in objective areas (rope gaps, crate ledge, every new puzzle arena) so the whole puzzle reads at once
• Five new puzzle stages after the original three beats:
  • S1 — stone wheel pit: roll a giant spoked wheel into a pit to bridge it
  • S2 — tilting bridge: an off-center pivot plank over a drownable pool that tips as he crosses
  • S3 — wheel step: roll a smaller wheel against a shelf and climb over its crown
  • S4 — rope-climb chasm: leap into a hanging rope, climb hand-over-hand (Up/Down), pump a swing, detach with Space
  • S5 — the cart: push a rolling two-wheel cart against the final wall and climb out via its deck
• Limbo street lamps: leaning black poles with swinging lamp boxes, irregular flicker, additive bloom that punches through the vignette, and water drips that fall from the lamps and ring the pools; foreground colossi never park in front of a lamp
• Reactive grass: dense meadow of sharp tapered blades on every walkable surface (no bald patches); blades bend away under his feet and spring back with an under-damped wobble; double-layer wind sway
• Drowning rework: head under the surface → panic arm-flailing builds → held under >1s → he loses buoyancy and slowly sinks, fade-to-black, checkpoint respawn (8 silent checkpoints)
• Forest depth: per-slot tree size classes (hulking near-trees vs slender far ones), curved sub-twigs on every branch, denser overlap
• Rope physics: livelier pumping, multi-rope support, no re-catch after release; Space bound as the action key (detach/swing-launch off ropes, grab crates/cart)

Post-iteration bug fixes (user reports)

• Abyss soft-lock: falling into the S4 chasm without the rope used to leave him standing in the dark forever — any fall below the world's abyss line now fades to black and respawns at the last checkpoint
• Cart pin: the cart could be parked flush against the S4 platform ledge where nobody can stand behind it to push — an invisible curb (the boy walks straight through it) now keeps a pushing slot open, and a haul-assist force makes pulling the grabbed cart genuinely work (+371 px/4 s in the probe, grip held)
• Respawning inside the wagon: if the cart/crate/wheel was parked exactly on a checkpoint, dying could respawn the boy inside it — the spawn now slides sideways along each checkpoint's solid span until it finds clear air; verified with a 24-scenario adversarial sweep (every checkpoint × every movable obstacle parked on it × abyss death)

Evidence

• 49/49 automated checks at 60.0fps: full scripted playthrough of all 8 beats/stages, rope-climb probe, drowning flail/sink/respawn probe, abyss-fall respawn probe, wagon-on-checkpoint respawn probe, lamp-glow + drip pixel checks, grass-reaction probe, objective-zoom probe, fill-window viewport at 3 sizes, palette/brightness/grain/ripple analysis
• Space binding verified end-to-end: swing-detach launch lands the gap (vx 4.5 at release), and Space-hold grabs/pulls the crate

S1 wheel pit
Tilting bridge with light pole
Lamp bloom over pool 1
Cart mount at the final wall
Finale fireflies

iter6-playthrough.mp4

Previous iterations

• Iteration 5: full-window cinematic zoom, jointed character rig (knee/elbow limbs, sin-gait), head-under drowning, synthesized Web Audio drone
• Iteration 4: darkness & density overhaul — dense film grain, aggressive vignette, DOF blur layers, colossal foreground trunks
• Iteration 3: tree visual fidelity — organic trunks, gnarled branches, glow pockets, god rays
• Iteration 2: swaying silhouette trees + extended level
• Iteration 1: core demo — three physics beats, monochrome palette, self-evaluating Puppeteer loop

How to play

Open limbo-parody/index.html in a browser (needs internet once for the Matter.js CDN). ←/→ run · ↑ jump · ↑/↓ climb ropes · Space (or Z/X/Ctrl) hold to grab crates & the cart, press to swing off the rope. Don't keep his head under water too long, and mind the chasm.

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