I played this game on my stream (VOD).
Overall, I had a lot of fun! The game reminded me of Lemmings. I played a couple of levels on Normal difficulty (I think), and it was fun trying to get the bonus gear before getting all 3 birds to their clock. When I failed a level, most of the time I knew it was my own fault for drawing lines in the wrong place.
I think this would be a fun mobile game where you can use your hands to draw the lines, though I wonder if having to scroll the screen etc would be an issue.
On the PC (where I played), there was a few times that I felt like I wasn't drawing lines where I intended, either the lines were starting or stopping early. It could have been my control of the mouse, or something, but might be worth looking into if others found the same issue.
Fun game!