for those who suck @ throwing: click & hold pet, drag mouse below screen, go up around the screen, and enter the top of the screen, and let go the instant you enter.
@ beepbeep: the idea, as far as I can tell, of leveling up is not instantneous improvemesnt, you have to purchase instantaneous improvement. also, once you have played for a while, you can easily buy your way up the boosts again.
for those who are in need of throwing help: just click on pet and hold, drag mouse below game, drag mouse up around edge of game, and bring down into game window, releasing mouse at same time. timing takes practice, but you can easily get 4k this way