Grey matter is done, got a bit weird in Sam's last section but it pulled itself together for the final. I did guess what was going on about two or three chapters from the end, which is unfortunate as I always like being kept in the dark until the big reveal in these sort of things. at the end everything was sorted out with no lose ends and the credits rolled with some pretty artwork and a nice song. there was a weird clip at the end of the credits that made no sense to me but it hardly spoiled anything.
I will criticize the game for certain failures in understanding Britain. for example sam accepts the role as assistant for fifty pounds a week, the students in the experiment get paid fifteen, and all of them act like this is worthwhile payment for their time. the terrible 'typical English pub' and the wooden road signs too show a serious lack of understanding (or perhaps deliberately misleading view) of this fine country. there were a few other examples of not doing the research, but I didn't let them bother me much because it managed to tell a good story along the way.
some people don't seem to like the cutscenes because they aren't done in-game but tbh I loved them. the character models don't allow for a great deal of expression and the animations are wonky enough that it would have been very distracting in a cutscene. the change to the painted look helps mark the beginning and end of each chapter better than anything in-game anyway.
it avoids some of the worst sins an adventure game can commit, namely pixel hunting and lack of direction. hitting the space bar reveals all the objects you can click on, an objectives screen tells you how much is left to do before the chapter is finished, while the map tells you when you have finished in an area. its helpful without spoiling the puzzles. the inventory is a bit of a mess though, most items stick with you until the final chapter so finding what you need can sometimes take longer than it should.
it told a strong story, with excellent music, and had sensible puzzles that I could solve without going to a guide every five minutes due to some insane logic the designer had employed. at the end of the day thats really all I ask for in an adventure game and this one delivered.