The first thing that threw me off when I logged into this game for the first time. It was pitch dark, and all I could see wherever i hovered the mouse was blue squares(the tiles) it made quite a very poor first impression, if it was not because i had a friend who was playing and insisting it was worthy my time. I would have logged out in disgust there and then.
Disable it by default, have a hotkey to enable us to view them, say alt or something. We can permanently enable or disable it in the settings, so us who are used to seeing em, will do so.
Throw the tip in a few places, the tutorial. when hovering over digging action, "press ALT to see tiles." New players should get the gist of it.
TLDR. Get rid of the tile view on by default. It is ugly