I'm getting a little hooked on PD2. I kept playing, and sure enough, and the game got harder. I am having fun trying to blindly figure out the multiple routes.
The cursor could be a little faster. Otherwise, it's perfect. I think some would have a problem with the breather sections in what is essentially an arcade game. I have patience to go through those on multiple playthroughs, though. They can re-establish the atmosphere.
5 hours on the clock and I still feel a nice steady learning curve with just the base gameplay. There are so many nice subtleties right down to how to get the rythm of the fire button on targets at different distances.