Well, "anticlimactic" is largely subjective; don't go in with negative expectations. The ending caps an entire "wtf" journey that leaves so much to the imagination, a player can think about the game for days, weeks and MONTHS after completing the game which more than I can say about 99% of games I've played (and even enjoyed.) Take the game on the whole; it's more a cerebral experience than something so simple as "toy."I'm vaguely aware of an abrupt/anticlimactic/wtf ending, but that's about it.
Edit: think of it more as a world you're glimpsing and less a story you're following, i.e.: you won't know what's going on, but morbidly piqued curiosity is sometimes as satisfying as a satisfactory understanding.