Tedious game
The idea behind this is a little bizarre. But even given that, the execution is a bit iffy. First of all, why should the player be forced to hold the mouse button down for the entire game? Also, do you need all four sections in there? Just seems to make the game a little longer then it needs to be.
The concept isn't too great either. I feel like I'm playing a cheap PSA game. I'd say go back and rethink both the concept and gameplay.