That light projectile has beautiful dynamic lighting and shadow fx. And physics too, there's a pool table aspect to it. There's an issue with the keys input, cursor up/down scrolls the page TOO while working in the game, not sure whether that's a focus thing, but here's what I used to fix itch.io specific key input issues, an onclick handler for the canvas that does:
var mycanvas= document.getElementById('thecanvas');
mycanvas.setAttribute('tabindex','0');
mycanvas.focus();