It might be interesting to make bonus timeslots, say, a five second window to draw a certain shape with the ball and ribbon. say a coil, maybe do a figure eight. Maybe allow it so if you fully encircle a certain amount of dots, they explode and you get some points and power up.
This is the kind of game you want some classic power ups: lazer, deflection (you already got that), speed (the more you get the harder ti becomes), triplicate yourself and try moving three through the field (they would be a set distance from the original. Try making "boss fights" by having the player run through a scripted labyrinth, say something geometrically nuts like ikaruga style (though just in spirit).