Sky Sprint

Cinevva's analyzer read this game's design doc and its source, then wrote the brief below. "Make your own" hands it to the game creator as your opening message, so you start from a real spec rather than a one-line idea.

Create a 2D side-scrolling parkour survival platformer called "Sky Sprint" with natural disaster mechanics:

**Camera & Perspective:** Side-view 2D platformer with smooth horizontal camera that follows the player across a wide 3600px world. The camera clamps to keep the world boundaries in view.

**Player Avatar:** A 3D character model (male mini-character from Kenney pack) rendered on a separate canvas layer over the 2D background. The player is 38x54 pixels with double-jump capability (2 jumps max). Supports animations: idle, walk, sprint, jump, fall. Player has a ghost form that appears when killed during disasters - a translucent floating spirit with gentle bobbing animation.

**Core Mechanic:** Survive cyclical natural disasters on a platforming course. The game follows a pattern: 15-second calm periods → 3.2-second disaster roulette selection → 2-second hold → 30-second disaster event. Every 3rd round is a "special round" combining two disasters simultaneously. Player respawns as a ghost during disasters if killed, returning to their corpse location when the disaster ends.

**Movement Controls:** Arrow keys or WASD for left/right movement at 350 px/s. Space/W/Up for jumping (840 px/s initial velocity, gravity 2200 px/s²). Touch buttons show on-screen: left arrow, right arrow, and jump (up arrow) buttons in bottom corners. R key or on-screen button to restart.

**World Layout:** Three main platform sections at y=620 (ground level) with gaps between them at x=900-1070, x=2050-2240, and x=2960-3140. Underground shelters at three locations (around x=900, x=2050, x=2960) that go deeper (to y=710-720) and protect from tornados. Multiple floating platforms scattered at various heights (y=345 to y=530) for parkour navigation. Platforms are green with grass-like texture and lighter green tops.

**Disasters - Three Types:**

1. **Tornado:** A large animated funnel (280px radius) that spawns from either edge and moves horizontally at 230 px/s, reversing direction when hitting edges with a visual burst effect. Creates a magnetic pull effect on the player when within 2.2x its radius (pulling toward center, lifting upward). If player touches the tornado core, they get caught and spin around it for 5 seconds with rotation animation, then get launched at 3.2x the tornado's velocity with -460 vertical velocity for 1.1 seconds before dying. Shelters (underground areas) provide protection. Visual: gradient funnel from light top to gray base, white spiral lines, debris particles, continuous loop sound effect.

2. **Meteor Shower:** Meteors spawn at random x-positions above the visible area at 0.28-second intervals. Each meteor has randomized size (14-26px), falls at 560-740 px/s with -120 to -180 horizontal drift. Red warning boxes appear on ground at impact locations. Meteors show glowing orange cores with yellow-white tails, create impact bursts (44+ size*2.4 radius) on ground collision with explosion sound. Instant kill on player contact. Sky tints orange during meteor events.

3. **Wave/Flood:** Three sequential waves spawn from alternating directions (left or right, randomized). Wave variants: small (240x140, y=500, 390 px/s), medium (320x210, y=430, 450 px/s), or large (420x280, y=340, 520 px/s). Waves show blue gradient with white foam caps and splash particles. Water flood level rises to y=420 during wave disaster at 210 px/s, recedes at 180 px/s. Player dies on wave contact or if submerged in flood water. Blue mist overlay and rain streaks appear.

**Roulette System:** When disaster cooldown ends, a roulette UI panel appears at screen center showing three disaster types (🌪 TORNADO, ☄ METEOROS, 🌊 ONDA) in a horizontal lane. The roulette spins for 3.2 seconds with accelerating tick intervals and sounds, center mark indicates selection. After 2-second hold showing chosen disaster, that disaster begins. Roulette uses deterministic random seeding for room code synchronization.

**HUD Elements:** 
- Top bar with 3 rounded white panels: "Rodada: [number]★" (round counter, star indicator for special rounds), center timer showing current disaster or countdown, "Recorde: [number]" (best round survived)
- Message banner below top bar with current status
- Disaster roulette panel (center screen when active) 
- Restart button below message
- Touch control buttons in bottom corners
- Room code display when in code-share mode

**Art Style:** Bright, cheerful 2D with gradient backgrounds. Sky gradients shift from calm blue (#66c7ff to #ecfbff) to dark stormy (#253b5c to #8ca0b7) during disasters. Sun in top-right with glow. Parallax cloud layers (white/gray puffs). Layered background hills in blue-gray and green. Grass ground with vertical light stripes. Platforms have grass texture with highlights and shadows. Visual overlays for each disaster type (gray wind lines for tornado, orange glow for meteors, blue mist and rain for waves). Corpse shown as fallen character sprite when player dies during disaster.

**Audio:** Roulette tick sounds during spin, bell sound when roulette stops. Meteor start bell, impact explosion sounds. Tornado continuous wind loop (0.62 volume). Wave water crash sound. Disaster music (dramatic loop, 0.42 volume) and calm music (peaceful loop, 0.34 volume) that switch based on game state.

**Goal & Scoring:** Survive as many disaster rounds as possible. Score = rounds completed. Record (best) saved to localStorage. Special rounds (every 3rd) combine two disasters for extra challenge, marked with purple color and ★ symbol.

**Menu System:** Opening menu with Portuguese text offering "Jogar com 1 player" (solo mode with random seed) or room code options to create/join synchronized disaster sequences using shared 6-character codes. Menu explains code system uses same seed/disasters, not live multiplayer.