Hi, I'm so glad you're enjoying the novel ♡!! Currently DCR is not on Steam, but it will be! At the moment I am going through the Steam registration process, meaning I will make another announcement/devlog when this has been approved and the Steam page becomes available.
Much like the itch.io page, the demo will (of course) remain free to play, and I will continue to work on Chapter Two until it's ready for release!