I agree with your statement. I fully look forward to the projects the dev has created and put in this space for us, but four at once is A LOT and they're all VERY different from each other and getting into a creative headspace for each one takes a toll on people. Especially when only ONE person is doing it all!
This is not meant to persuade you to stop brainstorming and worldbuilding and whatever else. These can remain demos while the dev focus on which ever one they enjoy the most. In the end you want to create because YOU (the dev) like it and want to share it.
These stories are really good concepts and I'm a huge fan of "a crown of velvet thorns" myself but I've seen many people create IFs and then abandon it due to burnout or/and the anger/sadness that has built up due to pressure from the audiences side or the author themselves.
I wish you luck in your writing journey wherever that takes you and if you continue updating your stories I will happily read them.