Create tower.js

tower.js

@@ -0,0 +1,19 @@
+class Tower {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+    this.radius = 50;
+    this.color = 'blue';
+  }
+
+  update() {
+    this.draw();
+  }
+
+  draw() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2);
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+}