Seem to have lost a lot of my life strangely from playing this.
http://deathball.net/notpron/It's like the Stone but really it makes you think a lot more. I mean the stone doesn't require you to mess about with image programs or key mappings.
Took one look at puzzle 16 though and thought "time for bed"
Will face it with a fresh mind tomorrow. It is cunning as hell though. Needed a couple of hints off of the forum to start with. Once you get used to the way it works it becomes much more of a game to stretch your mind. Will probably be messing about with this one for ages.