Thank you so much for all the kind words ;v;. It's great to hear you were able to have fun with the demo multiple times! We plan to release Steps 1-3 late summer 2020, though we don't have a super firm release date yet. And Step 4 will probably come out in fall or winter 2020.
The base Steps will be totally free and extra content will be unlockable by purchasing DLCs. Each DLC will cost around $4USD on average, some more, some less.
We hope you have a great day, too!