It's a really addicting solid game. The physics are pretty solid and everything just works. User generated levels were a great idea.
And for medal nuts. To get Critic and Addicted just make a new tab click a user generated level on the levels section next to medals and pick a level on that tab. See the ID For the level and put that id in your other tab in the main menu from level select. As if you just click the levels above everything resets and for these medals you have to do it in one shot.
Another easy medal is playing level 2 and getting every star with one shot its surprisingly really easy just be patient as it will most likely take a couple of tries.
FInish all tutorial levels.
Fire 250 balls.
And create level.