<!DOCTYPE html>
<html>
<body style="text-align:center;font-family:Arial">
<h1>Galaxy Defender</h1>
<p>Score: <span id=s>0</span></p>
<button onclick="hit()">Destroy Alien</button>
<script>
let score=0;
function hit(){
score++;
document.getElementById("s").innerHTML=score;
if(score==10)alert("You Win!");
}
</script>
</body>
</html>
