I keep accidentally clicking the button in the bottom left and it opens a new window. I just close it, not a problem. But then it says the game lost focus, click anywhere to resume so I click. Nothing happens. The game becomes unresponsive and I have to reload the page.
Saving works fine for me. There's a note in the game description that explains this, but in case you still don't get it, this is how you get it to save:
1) Right-click
2) Click "Settings..."
3) Click the folder tab
4) drag slider to "unlimited" (all the way to the right)
5) Have fun
 "Knightmare Tower"){kind=icon}
 "Shop Empire 2"){kind=icon}