This games great!, just finished all the levels (need to go back and get perfect scores on some of them). I really loved the ghost ones, here's a cool swing I made.
Only thing I would say is that it would be nice to be able to save level designs.
Great solution to that one! You can save constructions: Hit the copy button after completing a level and then paste into a document. Then copy paste back into the editor when needed. A bit cumbersome, but it works...