Is this deck good for beginners? - UG Self Mill (Slogurk, the Overslime)

This is one of my first attempts to make a "precon" style deck with an obvious game plan and that especially that doesn't require prior knowledge to play.

I don't have nearly enough "play an additional land" effects but those are pretty price-gated anyway.

What do you think?

EDIT: The fetchlands are proxied.