The most important feature of a idle game is that you can run it in the back ground while doing other things. Which isn't the case with this idle game as you can't have it running in a different tab nor can you have it open in a separate widow. Because as soon as you leave the page or click on a different tab the game stops doing anything till you click it again.
Unfortunately, this is an engine limitation. I'll look into what solutions are available to me, but all I can do for now is offer workarounds. The game is designed so that you shouldn't need to leave it run for too long, so hopefully it isn't too big an inconvenience. Otherwise if you open it in a new browser window, instead of a new tab, and leave the window open, behind your first window, it should continue running.