Could be more user friendly.
I got kinda bored by the time I got to level 27. Could do with better music.
Also it really needs a line tool, instead of free-drawing with the mouse, like in ms paint where you click and drag the start and end point of each line. Otherwise you end up trying to draw a steep line and accidentally put a shallow step in it and you either have to wait an extra 5 minutes for the sugar to build up and move over it or you have to waste even more time and restart.