Ah, sorry about that. I suspect there's issues with the save/restore system, I didn't have time to look into it in the jam. Did you save and quit and continue later? If you're happy to send the crash report to dave@powerhoof.com that'd be super helpful!
Sorry for the delay. You got mail. As far as I can remember, I never saved and loaded, just played right through, but I see a "Save1.sav" so probably I saved. Or the game saved on itself? I don't know :)