Really great concept, I can definitely see it being a lot of fun once you're able to start grabbing other territories. As others have said there are some UI issues, in particular I ended up with so many cards that I could no longer click the Next Turn button. I think are also some balancing issues as I had huge amounts of water but struggled to get enough food.
I also noticed a little bug on the Hydroponics card (I think), it said I couldn't afford it despite it giving me 5 food, not costing 5 food.