Map Generation:
I think the map should be mostly vanilla but I really like how the clay was incorporated into the terrain. The map size as it is is good as well.
Ore distributions:
I think Iron is a bit too common with spawners in the game. I could see it being that plentiful to mine if we didn't have the spawners but as it is, it's EVERYWHERE.
Miscellaneous:
I think that it would be a good idea to setup a sort of tutorial plot in creative to show newer players how to build common circuits etc.
Some means of redyeing clay perhaps like how we can use bonemeal on double slabs etc. would synergize well with the abundance of clay on the map. eg. redye cyan clay from mountains