Absorb & Grow RPG (Working Title)

1. Overview

• Genre: Action Casual / Roguelike
• Platform: Web Browser (HTML5 Canvas 2D)
• Concept: Takes the classic Agar.io cell-eating mechanic and spices it up with roguelike perk choices. Eat smaller dots and particles to build up mass, then level up to unlock game-changing perks that shape your survival strategy.
• Languages: Instant switching between English, Korean, and Japanese (i18n ready).

2. Core Mechanics & Controls

• Controls:
  • Mouse: Move your cursor, and your character smooths its way toward it.
  • ESC Key: Pause/resume the game or bring up settings.
• Rules of Engagement:
  • Feeding: Scoop up static pellets scattered across the field to build your base mass and score.
  • Absorb or Get Eaten:
    • Chomp down on smaller AI particles to gain massive EXP and mass.
    • Touch a larger AI particle, and you'll shed mass—or instantly drop dead.
  • Mass vs. Speed Trade-off: The bigger you get, the slower you move. Sacrificing mobility for survival keeps every run tense.

3. Perk & Build System

Every level-up hits you with a choice of 3 random Perk cards. Combine them to craft a distinct build each run:

• Mass Contract: Sacrifices a chunk of your current mass in exchange for a huge EXP multiplier. (High risk, high reward.)
• Reckless Pursuit: Drops your movement speed slightly, but gives bonus EXP on your next 3 absorptions.
• Magnet Expand: Widens your magnetic aura, pulling nearby pellets and small particles straight to you.
• Emergency Escape: A life-saving passive—burns some mass to survive what would have been a fatal hit.
• Mystery Pact: Hurting your mass early on, but rewards you with massive speed and survival buffs once you hit Level 20.

4. Interface & UX

• Top HUD: Clean readout showing your level badge, current mass, and active perk chips at a glance.
• EXP Bar: Runs along the bottom edge, giving clear visual feedback on how close you are to the next level.
• Level-Up Overlay: Pauses gameplay on the spot with a subtle background blur, popping up 3 card choices for your next move.

5. Media & Utility Features

• In-Game BGM Player:
  • YouTube: Paste a YouTube URL to drop audio tracks right into your playlist.
  • Local Audio: Drag and drop your own MP3/WAV tracks.
  • Full Player Controls: Shuffle, loop (single/all), volume slider, and seek bar.
• Sound Boost Engine: Uses the Web Audio API to amp up audio volume and tweak the EQ.
• Language Switcher: Swap between English, Korean, and Japanese on the fly without refreshing.