Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles
Jobs
Tags

=shrug=

Forcing yourself to change your engine just because you only have the one possible export option seems counter-productive, I reread the jam page and it says "If at all possible, try to" release in non-windows exclusive.

I'd say go with what you know how to use and export in what you can.