I've gotten to the bonus achievement ending twice but the output hasn't increased, would I have had to click continue in the same session as reaching the end? I initially thought the resets were speeding up tree growth slightly, but the comment below made me realise it actually was supposed to double the resources per click which it hasn't done for me (I've been doing this over a few days, closing the tab after I reach the end and it takes me back to the title).
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Yeah it's not doing that. :( I have been closing the game after each win before clicking continue and coming back later in case that is linked. It does recognise that I've played before when I come back because it gives me the continue option and doesn't show the tutorial again, but it's still just 1 wood per click.