Phaser Matter не определен
// The default Phaser3 tutorial (Getting Started) implements an arcade physics phaser version
// If you're looking for one which has both (Arcade & Matter), use the full stable versions:
// http://phaser.io/download/stable
<script src="//cdn.jsdelivr.net/npm/phaser@3.55.2/dist/phaser.js"></script>
FIAB