Really nice game!
Sadly, there seems some out-of-sync issue with timer and movement of the objects:
- In Firefox, level 4 was broken. I couldn't pass it, the first interval always threw the object on the ground.
- In Chromium, some of the levels I had to restart once or twice without changing anything until it worked. First tries failed due to fast / slow movement of the objects. I got stuck at level 9 ( "7 left for start"), because the top yellow always fall in the blue box at the first interval, no matter how often I tried.