Well done!
Complex, creative puzzles (Though some are easy to cheat past with the right arrangement of pieces... I only used those when I absolutely could not pass the level and the provided solution came up as "WRONG"... heh...) and great physics. I wish it was longer... make a sequel! One complaint is the "WRONG" message... I'd rather restart it manually, since I ended up hitting "START" instead of "RESET" all the time when I tried to avoid getting a "WRONG". I suggest more piece sizes, maybe some conveyor belts, and the ability to pass levels like this one:
S19|267|130|-64,S11|75|45|0,S19|214|1 59|0|F,S4|353|272|0|F,Basket|615|283|
-50|F,Ball|172|135|0|F,
S19|235|185|0,Ball|423|18|0|F,Basket|
185|415|0|F,S4|321|254|0|F,S1|408|86|
-56,
(Which is really two levels designed to go on top of each other. Right now, I can get both balls in the baskets, but the level won't end.)
Oh, and maybe speeding up the playback, since some levels were long and I kept making very slight adjustments to pieces near the end. The graphics are great, the music is nice... it's really hard to complain. I would like to submit scores here and name levels, if that isn't too much trouble. 5/5, 10/10, favorite.