Last night I finished up my first full play through of Timespinner. I spent about 10 hours total on that (I was a bit on the slow side, probably because I did a lot of back tracking and optional stuff), did not find everything, and it looks like there's at least 3 more endings with one of these probably being a minor variation of the one I went for. It was fun and odds are good that I'll give it a couple more NG+ replays to at least get the different endings.