I have spent many hours playing this game, very fun. Certainly not perfect, the UI of the research menu can make it a little unclear what you've already researched for example, and could perhaps do with a few more options regarding the economy and such. However for how simple it is in concept, the replayability is top notch, because there are infinite iterations of what you can build and it is incredibly fun to throw your fleet of barely airworthy battle barges at the enemy.