Hello again. Sorry for the late reply. Unfortunately, that first reply turned out not to be inaccurate, and the Extended Edition does not transfer over to Steam. This version is standalone, and has to be purchased separately on those two platforms. Again, very sorry for that. If you'd like, you can potentially contact itch.io support and request a refund, which we would authorize, so that you can get it on Steam instead. Thank you so much for playing!