Hey all, thanks for your patience. I apologize for not responding to this sooner; recent life circumstances have kept me unable to access my emails and socials. It seems that I mistakenly uploaded the Steam version of the game to Itch, which includes infrastructure that communicates with Steam's API. The latest version (labeled 'Soracca for Itch') should work on any Windows device without the need for Steam.
That being said, this is a difficult issue for me to troubleshoot on my end. Please let me know if the latest version still does not work for you. Alternatively, if you would like a Steam version, please send me a direct message on Twitter with proof of your purchase of the Ukraine bundle, and I will get you a Steam key.
I'm super appreciative that, out of nearly a thousand games, you chose to give your time to mine. I'm sorry that it didn't work for you straightaway. Thanks so much for bringing this issue to my attention; I hope that you are all able to enjoy The Manse on Soracca.