I tried using a simple design game editor 'Ct.js' that can create 2D games for free This article, originally posted in Japanese on 23:45 Sep 21, 2020, may contains some machine-translated parts.

If you want to learn to create relatively simple online games using Javascript, then the HTML5 Game From Scratch Step By Step Learning JavaScript course is a great place to start.

It is similar to an old Galaga style game with the following features. The objective is to learn using JavaScript programming through making Space Shooter Game.