I really like the concept of the game - filling spaces, leveling up, and maximizing land use for the highest score possible. I managed to reach 861 on my first try. I think adding a 'Game Over' popup when you run out of cards would be a nice touch. Including a mini tutorial for first-time players instead of just instructions. Like a mini run through including gameplay. And hover text that explains what each card does would also really help with the learning curve. It has a lot of potential.