Hey, give it a shot, and I'm not saying you'll hate it now or anything. But my interest definitely peaked at the initial "reveal," as I was only vaguely suspecting it based on hints in the story. After that, it's still interesting to see where it leads, but it was all kinda downhill once I understood what was going on.
edit: I thought about it a little more, and there's definitely still merit in reading it after getting spoiled. It explores some interesting concepts that are worth reading. I guess it's comparable to something like Little Busters where you can still appreciate the story and themes if you get spoiled but you lose the impact of the reveal. Except in this case, I felt that impact was a rather large portion of overall enjoyment, possibly because the story itself is pretty short.