The art is really beautiful!
I think a few things could be improved, like the UI or showing how many points each tile is currently generating.
I also noticed that I could place tiles on top of each other indefinitely until I ran out of them. I'm not sure if that's intentional, but you might want to add a limit.
It might also be nice to separate the camera controls from the tile placement controls, so players have more freedom to look around the map and then swap to place tiles.
Other than that, great job! :D