Stayed for longer than expected but got bored at the end in City Zone. And when I returned after closing the page I lost all my progress... could use a save feature. I know saving in web is not reliable but at least something.
I think you intentionally went for cluttered UI that fills all screen but I would still prefer if it was organized in tabs.
And Unity has option to make the game run even when game is not in focus you should check that option so people can leave the game open in other tab.