Good start, but I would recommend adding a feature where the game will progress when it isn't the main tab opened. Idle games should be designed to be idle, to progress and come back to the game to decide upgrades, buy equipment, etc. Right now it auto battles, but isn't really an idle game.
Maybe I missed it in the tutorial, but is there a button to auto-advance after one completes the level objective. I like the game so far, but it doesn't make sense for an idle game not to auto-advance by itself.
It would be nice if you included a +10 button for the bonus points. That way, later in the game, we don't have to click 400 times to get to where we want.
It would be nice to receive a bonus for mining a certain amount of each resource. For example: mined 100 unobtainium, doubles monetary amount received with each new unobtainium mined; and or doubles the chances of receiving a gem.
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[Copied Answer] That is not something i control.... WebGL only allows if the tab is open, but just put this game in it's own window, then it'll run :)