A future Steam release is possible, but I love Itch and wanted to prioritize them. There's also a fair bit of extra work involved in a Steam release, like adding achievements, cards, and other stuff. I sincerely wasn't expecting the game to do as well as it did, and now that it's getting attention, I'm glad to have a smaller audience while I fix the bugs people are finding and working on the features people really want. So! Itch is Mixolumia's home for now, and we'll see about a slow rollout to other platforms.
I'm sorry there's an issue with currency, I didn't know that would be a problem! I also didn't expect people from around the world to want my game! Send me an email at hello@davemakes.com or DM me on twitter @davemakes and we'll figure something out.