Really cool puzzle game. I see you also went with a color mixing game (Though your puzzles are harder than the ones I came up with for sure!)
Once you beat level 7 the next button doesn't take you back to the menu or an end screen or anything, which was kind of confusing.
The fireflies would sometimes get stuck when I tried to place them on the tiles and it was hit or miss trying to get them to move again.
At one point I had the level seemingly beat but it wouldn't register: