Really nice little game,
it still took me 3-4 attempts before understanding what I needed to do (~^w^)~ and 5-8 more before I managed to go to level 4. As you said in another comment, a small tutorial would be great (for example, first time playing I was wondering if I needed to match a complementary color or their color, and I was wondering what I needed to do to win the level)
Anyways, it was pretty fun ! Well done !