So my first impression is that this has the potential to be a really good game. It still seems a bit unpolished, but that is to be expected with an early access release still hot from greenlight.
In my first opinion however, the terraforming seems more clumsy than anything. It's very hard to get an even surface across multiple sections and it is difficult to shape the landscape with any finesse.
I'm also not terribly impressed with the 1st person view, as it seems a feature more useful for providing screenshot than anything. But, I'd much rather see the city-building aspect of the game developed than have 1st person improved.
This all being said, I mostly liked what I saw and I hope to see move development in the future.