The game keeps a running score, but given its predilection for flashing messages like YOUR SCORE IS 4 OUT OF 8 I wasn’t really sure what to believe, until I noticed something on the Carnival (that place that was crashing my game) — the “SCORE” in the corner seems to be accurate. If I do something that is Island-friendly, so to speak, the score consistently goes down.
Fortunately, typing EXIT leaves this place safely without crashes.
I found this testing out the hospital; each visit costs 20 points.
Additionally, at the slot machine where you enter a “piece of yourself” to spin, each spin costs 1 point.
After a number of other tests, I found that if you “discover” the clone room in building #19 (just push “L” for left, then type “NO” about knowing about cash) you earn 40 points. This action can be repeated over and over and over for 40 points every time. Fairly soon I was looking at 767 points.
These sort of wild swings suggest to me that perhaps score is entirely meaningless and just another red herring meant to keep you trapped on the Island. At least I managed to “discover” something, though?
Where I’m really stuck is still finding a cross. I get trapped whenever I enter the church. If someone knows the way out and can ROT13 me a line, I’d appreciate it. (No hints if I’m barking up the wrong tree entirely, though — that’s part of the experience, I gather.)
Renga in Blue 
Will the game end if your score ever exactly equals your secret number?
That would be wild — I’ll have to test it later.