I can't pass the second level, the game is confusing. The idea is interesting but I recommend improving the mechanics. But good job :)
It took me time to find the answer, but it is incredibly simple, and you can go play 4th level (which is harder, though).
Thank you for playing, when I expand this game I would like to introduce mechanics a bit slower with a more gradual difficulty curve. If you are interested I have added a guide with hints and full solutions to this page.