Good news for you actually. The bouncer mini game does have a key, left and right arrow on your keyboard. Now for the plank minigame it works as though you have to click when the purple bar is close to the arrow. And that replenishes your stamina on either side. If you can hold it for a minute that's one energy point. The longer you hold the more energy you can get :). Weird how the money notif works. I'll fix that right away and release a patch.