I think the overworld levels need to be redone without the pics1 detailing mentality, the tileset looks great itself you don't need to try and dress it up with two-tile tall grass and other random decoration. The cliff stairs blend in too much as well but that's really not all that important to change just a mention.
This really wasn't a preview (imo) at all and would of made more sense had you called it Pre-Opening II. I guess I was just expecting some actual gameplay this time around because of the two-week postponement.