This game takes the basics (like the production chains) from games like Anno to make a defensive city builder that can entertain you for a nice couple of hours. For the current asking price, that is absolutely fine. But don't expect long-term motivation or real depth - in just those few hours you will have built pretty much anything there is to build, and there doesn't seem to be anything like upgrades, policies or events that would spice things up in the late game. Still, I'm impressed by what a team of just two people came up with.