Great concept, fun game!
Played a bunch on the browser, tried to export the files to run on the Desktop, and the _skills.dat file is not being exported.
I actually couldn't recreate this issue. I know a few people are having it so I'm trying to track down the cause. Do you mind telling me which Browser you're using?
EDIT: Okay, I think this is an issue with Chrome specifically. I pushed 0.4e that has a new export button that probably fixes the problem.