It's possible to save ALL animals and collect ALL acorns. For 2-2 : I just kept jumping, at some point it touched one of highest acorns, same for second - just keep jumping! And be sure to hold W (or up) all the time while jumping!
People, if it's hard, try to train 6 mana and THEN click "skip tuturial" - you will save a train point, and it means that you get 5 days for FREE! It really helped me alot, so I'm suggesting you to try.