Thank you for your detailed feedback and suggestions. :)
I've already had suggestions about adding enemies, but I don't think that's right for an idle game that you're supposed to be able to leave running on the side.
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If a truly idle game is the intent, then I think you're absolutely right. In that case, you need to identify the "just one more" incentive - the reason why I would switch back to the game window and pay attention to it instead of whatever else I am currently doing, otherwise it is little more than a soundtrack or a glorified interactive wallpaper haha.