The ad sucked.
Personally, I think a tutorial would be better than the vague instructions you gave (I consider a tutorial instructions that let the user practice). I can't seem to make the instructions reappear either. The achievements seem to change randomly, and they don't seem to signify anything. Multiple achievements for completing a single level... Moving on.
As far as game-play goes, it strikes me as clumsy. The dots are too close together, meaning you often accidentally connect extra dots. The connecting sometimes stops in the middle. I would try to connect four dots and it would stop at two. The stroke is presented with a pixel image, but since you put the stroke on top of it, it isn't clearly visible. So a stroke that has five dots appears to have only four. Also, the first stroke of a level is sometimes impossible given the arrangement of dots.
Putting all that aside, I liked the idea of the game. I don't know if it's completely original, but I haven't seen any others like it (That could just be ignorance on my part). I get the feeling you tried to fit too much into a small package. Sort of like trying to write a novel with only ten pages.
Anyway, I hope this criticism is seen as constructive and that the next game you make turns out better than this one.