Well I got double the money, meaning I carried over my money, but also got the same amount on top of it. But my stats didn't carry over, I started over at groundlevel again. I also found out through reading the save file that my mobility was -979 (shown as 1).
Is the goodboy ending also there where the boss eats Limbo and tells you "Game Over"?
If not, then I guess I found a bug. I could send you save files from just before I entered the Boogie Boss and right after the "reset" happend.