Awesome "mario paper like" art, really liked it(especially in fullscreen). Also the puzzles are not to easy and not to hard(expect of the one that is the third on your screenshots), so they are not boring and not frustrating either.
About the one that is the third on your screenshots it's just not straighforward that you can throw those little opossums on the log. Also in my opinion current opossum should have some specific outline or something, so you know which you chose. (And please don't make "space is not a jump button" mechanic ;) )
But overall you did a great job!