The PK Girl does not work well in v5. You need to download v4 runner inorder to play it correctly. In v5, going "west" in the mall in Chapter 1 creates a bug that jumps you to chapter 7 in The Plaza. Inevitably, you can't go anywhere after that and have to start over. Just thought I'd share.
Unfortunately, Adrift 4 compatibility is probably never going to work (possible?), unless Campbell sits down and does it very thoroughly AND asks other drifters to test several games. In that case, the Adrift 4 conversion might actually work. Also, as it is, the conversion depends on the library that the user selected in the Developer which I think is very wrong. An internal library should be used for the internal conversion from Adrift 4 to 5 so the game appears as good as possible. When you play an Adrift 5 game, you don't get to chose anything either unless the author wants you to.