Tried a bit of it but the touch screen usage on games is inaccurate and not really nice. One with drawing lines between spots on a grid makes you end up drawing at least 3 other lines at a time and having to keep switching to the "erase" tool to undo it.
Interesting theory though... a puzzle game compilation designed to help you either
a) enjoy puzzles in the day at your leisure
b) play some puzzles relaxingly when you can't sleep so you pass out