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(+4)

There are a few technical things going on. For one, everything is flat colours (unlit shading, this is a specific kind of shader), and is also on a lower resolution then upscaled to regular size, which is what makes it look pixelated.

(+3)

Here's a tutorial of the upscaling technique by max turnbull for unity

https://www.patreon.com/posts/tutorial-easy-lo-29017696

There's no real name for the style other than maybe lo-fi 3d.