Very fun, though a bit QWOP/Getting Over It in places. I got 15/15 and all 3 big stars on every level, but it still said only 97% complete when I finished the last level. Very strange.
I wonder if it's because I got one of my missing big stars and exited a level without re-completing it, or if I didn't hit a save point after getting my last star, or if there's some other secret I missed. All the levels are sparkling on the overworld.