Nice project, dude! I took a look at the source code. If you want to have more control over the graphics, I don’t recommend using the 2d canvas methods directly, but rather creating a Buffer (array) and rendering each pixel. This makes it very easy to create more pixelated graphics (circles, for example). See that engine example https://github.com/Rybar/js13k2017/blob/master/src/js/lib/Engine.js