Terra 2D Pixel Adventure

Create a Terraria clone in a single HTML file using Canvas and pure JavaScript (no external libraries). The game should include:


World & Generation:

2D procedural world generated with Perlin noise (400x200 tiles)
Biomes: Forest, Desert, and Snow Tundra, determined by noise
Terrain with undulating surface, procedurally generated caves
Bedrock layer at the bottom
Auto-generated trees (leaves + trunk) based on biome
Ores: Iron, Gold, and Diamond distributed by depth

Player:

Movement with WASD/arrows, jump with Space/W
Health system (100 HP) with passive regeneration
Fall damage if distance exceeds a threshold
Death with automatic respawn (drop inventory on death)
Sprite drawn with Canvas (pixel art, no external images)

Block & Tile System (16x16 pixels):

Procedural textures generated in Canvas for: Dirt, Stone, Grass, Sand, Wood, Leaves, Iron Ore, Gold Ore, Diamond Ore, Snow, Torch, Plank, Workbench, Bedrock
Solid/non-solid tiles with hardness for mining
Mining mechanic (left click) with visual progress bar
Block placement mechanic (right click)

Inventory & Crafting:

40-slot inventory with 10-slot hotbar (selectable with 1-0 keys and mouse wheel)
Inventory UI with drag-and-drop, sort button
Armor slots (head, chest, legs)
Scrollable recipe list, crafting with R key or click

Items & Recipes:

Tools: Wood/Iron/Gold/Diamond Pickaxe (with power and speed stats)
Swords: Wood/Iron/Gold/Diamond (with damage stats)
Armor: Iron/Gold/Diamond (Helm, Plate, Legs with defense)
Metal bars (Iron Bar, Gold Bar, Diamond) as intermediate materials
Healing potions (normal and greater)
Slime Crown to summon the boss
Gel as a slime drop
Crafting recipes for everything (e.g., 12 wood + 6 plank = Wood Pickaxe)

Enemies:

Slimes (jump around, spawn day and night, drop Gel)
Zombies (spawn at night, deal more damage)
Bats (spawn at night, fly toward the player)
King Slime (boss summoned with Slime Crown, 500 HP, drops gold and spawns small slimes on death)
Max 12 entities simultaneously, random off-screen spawning
Knockback when hitting the player

Day/Night & Environment:

Day/night cycle with sky color transition
Animated sun and moon
Twinkling stars at night
Moving clouds
Snow particles in Snow biome, sand particles in Desert biome
3-layer parallax mountain backgrounds

Lighting:

Sunlight that gets blocked underground
Torches with radial illumination (10-tile radius with falloff)
Darkness overlay with variable transparency

Audio (all procedural with Web Audio API, no audio files):

Procedural BGM that changes based on biome and time (forest_day, forest_night, desert_day, desert_night, snow_day, snow_night, underground, cavern)
Each pattern with different root note, tempo, scale, melody, and bass
Sound effects: mining, placing, hitting, pickup, hurt, death, crafting, jumping, splat, item use
M key to toggle music

UI:

Health bar with visual percentage and text
Defense indicator
Hotbar at the bottom with numbers and selection highlight
Inventory panel with grid, armor section, and crafting recipe list
Top-right info panel: Day/Night, current Seed, current Biome, Depth zone
Floating centered notifications
Death screen with respawn countdown
Tile highlight cursor
Controls displayed at the bottom

Technical:

Game loop with fixed timestep (60 FPS)
Tile-based collision for player and entities
Camera with smooth player tracking
Everything in a single self-contained HTML file
Pixel art with image-rendering: pixelated
Crosshair cursor