It's 98% art, 2% game
If you look online, you'll find a devoted following for this "game." However, there are just as many people who hate it (myself included). I get what the author was trying to do (and I won't spoil it here). My interpretation is that it's more an emotional exercise and reflection than it is a game. But that's the point -- Passage is exactly as you interpret it to be. Apparently, many people find it to be an interesting thought experiment that evokes strong emotional responses. I didn't. Personally, I found it to be an interesting metaphor but not at all an interesting application nor game. If such a program moves someone to tears (as recounted by several players), I fear perhaps we've all become too sociopathic. I won't say it's not worth the $0.99, as it's apparently worth much more to many people. But for me personally, I found it to be a waste of five minutes and a dollar.