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HTML

<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Galactic Defender</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

body {
            background: #000;
            overflow: hidden;
            font-family: 'Arial', sans-serif;
        }

#gameContainer {
            position: relative;
            width: 100vw;
            height: 100vh;
        }

#gameCanvas {
            background: radial-gradient(circle at center, #000 60%, #1a1a2e);
        }

#hud {
            position: absolute;
            top: 20px;
            left: 20px;
            color: #fff;
            font-size: 1.5em;
            text-shadow: 0 0 10px #00f7ff;
            z-index: 2;
        }

#gameOver {
            display: none;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: #ff0000;
            font-size: 3em;
            text-align: center;
            text-shadow: 0 0 20px #ff0000;
            z-index: 3;
        }

#restartBtn {
            margin-top: 20px;
            padding: 15px 30px;
            font-size: 1.2em;
            background: rgba(0, 231, 255, 0.3);
            border: 2px solid #00e7ff;
            color: #fff;
            cursor: pointer;
            transition: all 0.3s;
        }

#restartBtn:hover {
            background: rgba(0, 231, 255, 0.6);
            transform: scale(1.1);
        }
    </style>
</head>
<body>
    <div id="gameContainer">
        <canvas id="gameCanvas"></canvas>
        <div id="hud">Score: <span id="score">0</span></div>
        <div id="gameOver">
            Game Over!<br>
            <button id="restartBtn">Rejouer</button>
        </div>
    </div>

// Configuration
        let score = 0;
        let isGameOver = false;
        const player = {
            x: 400,
            y: 500,
            size: 30,
            speed: 8,
            color: '#00f7ff'
        };

let bullets = [];
        let enemies = [];
        let particles = [];
        let lastEnemySpawn = 0;
        let keys = {};

// Initialisation
        function init() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
            
            window.addEventListener('keydown', e => keys[e.key] = true);
            window.addEventListener('keyup', e => keys[e.key] = false);
            restartBtn.addEventListener('click', restartGame);
            
            gameLoop();
        }

// Boucle principale
        function gameLoop() {
            if(isGameOver) return;

ctx.clearRect(0, 0, canvas.width, canvas.height);
            
            handleInput();
            updatePlayer();
            updateBullets();
            updateEnemies();
            spawnEnemies();
            updateParticles();
            
            checkCollisions();
            requestAnimationFrame(gameLoop);
        }

function updateBullets() {
            bullets.forEach((bullet, index) => {
                bullet.y += bullet.speed;
                ctx.beginPath();
                ctx.arc(bullet.x, bullet.y, bullet.size, 0, Math.PI * 2);
                ctx.fillStyle = bullet.color;
                ctx.fill();
                
                if(bullet.y < 0) bullets.splice(index, 1);
            });
        }

function spawnEnemies() {
            if(Date.now() - lastEnemySpawn > 2000) {
                enemies.push({
                    x: Math.random() * (canvas.width - 30),
                    y: -30,
                    size: 25,
                    speed: 2,
                    color: '#ff0000'
                });
                lastEnemySpawn = Date.now();
            }
        }

function updateEnemies() {
            enemies.forEach((enemy, index) => {
                enemy.y += enemy.speed;
                ctx.beginPath();
                ctx.arc(enemy.x, enemy.y, enemy.size, 0, Math.PI * 2);
                ctx.fillStyle = enemy.color;
                ctx.fill();
                
                if(enemy.y > canvas.height + 30) enemies.splice(index, 1);
            });
        }

function updateParticles() {
            particles.forEach((p, index) => {
                p.x += p.velocity.x;
                p.y += p.velocity.y;
                p.alpha -= 0.02;

ctx.beginPath();
                ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
                ctx.fillStyle = `rgba(0, 247, 255, ${p.alpha})`;
                ctx.fill();

if(p.alpha <= 0) particles.splice(index, 1);
            });
        }

function checkCollisions() {
            enemies.forEach((enemy, eIndex) => {
                bullets.forEach((bullet, bIndex) => {
                    const dx = enemy.x - bullet.x;
                    const dy = enemy.y - bullet.y;
                    const distance = Math.sqrt(dx * dx + dy * dy);

if(distance < enemy.size + bullet.size) {
                        createExplosion(enemy.x, enemy.y);
                        enemies.splice(eIndex, 1);
                        bullets.splice(bIndex, 1);
                        score += 100;
                        scoreElement.textContent = score;
                    }
                });

const dx = player.x - enemy.x;
                const dy = player.y - enemy.y;
                if(Math.sqrt(dx * dx + dy * dy) < player.size + enemy.size) {
                    gameOver();
                }
            });
        }

function gameOver() {
            isGameOver = true;
            gameOverScreen.style.display = 'block';
        }

function restartGame() {
            player.x = canvas.width / 2;
            enemies = [];
            bullets = [];
            particles = [];
            score = 0;
            scoreElement.textContent = score;
            isGameOver = false;
            gameOverScreen.style.display = 'none';
            gameLoop();
        }

window.addEventListener('resize', () => {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
        });

init();
    </script>
</body>
</html>

CSS