Welcome to my guide on making pixelly graphics in Blender. The way this will go, is essentially making sure that you have the right resources to even do this, and the kind of understanding you must have.
So first of all, you'll need blender. Yeah, obvious I know, but needed nonetheless. Version doesnt matter but I'd recommend the latest one.
Now, you need an extension. This is the gumroad pixel art extension. I am not going to explain how to use it, as it explains how to on the site, so when using it you should know whats going on.
Default settings: To get what I have, I would generally say to use a camera size of 1000-2000 pixels large.
Search up anti aislasing and turn it off, to make it not smooth.
In render setting, make the compositer show up either in the camera or at all times, so you can see your effects.
Everything else you want to do is up to your preference.