Nice graphics, not gonna lie! And I see you made them all by yourself? That's highly impressive.
I like the combination of a classic game with some twist. So nothing to complain about at this place!
Only one thing about feedback maybe: I found it a little difficult to understand why I could not place some buildings. Of couse I could read the help texts but at first, this is a huge flood of text. Maybe, direct feedback (like a popup "you need a minecart near!") could make this a little more handy.
Apart from that, awesome job!