Really cool concept! Great physics, lots of levels and good difficulty progression adding new elements to the scene every few levels. I quickly got hooked.
I love that you can restart the level quickly since you (at least myself) might need to restart it a few times to get some challenging levels done.
Just as a couple of small comments, I’ve noticed that there is some latency sometimes while dragging the Moon. The other thing is that I found a bug while deleting moons, the moon is deleted but the counter is not restored (it does not happen in every level, I can reproduce it in level 15), fortunately you can go to the main menu pressing the “m” key and try again, so no big deal. :)
I enjoyed it! Well done!