I should mention I'm on a trackpad and this would probably a little less difficult with a decent mouse, but I found this to be quite frustrating. The play area took up less than 1/16 of the game's window and the mushrooms were only a couple pixels wide so when it came time to mass click it required tiny movements while clicking extremely fast, which just isn't possible for me.
It would be nice if I could just hold down the mouse and drag across mushrooms to collect. IMO this would focus on the puzzle aspect more, too