Basically there was only one correct decision in terms of being saved, the rest lead to damnation. If you hadnt realized it the bad guys are actually aliens. I absolutely loved that movie as well. like your style.
If you are looking for another mind bender watch "Triangle". It has to do with the bermuda triangle, and i cant say anymore or i will give it away. It is a hell of a thriller and if you can figure out how that one works i commend you, it took me 2 times watching it to put all the pieces together. All i will say is keep in mind that a trianlge has 3 points. The number 3 will be extremely significant, if you can figure it out that is. If not 3 will me nothing more that a number.
Also look into a movie called "primer" another good suspense/thriller/sci-fi.