Hello, sorry for the late response. Many holidays in my country and I was not generally as available as before.
It will not be stable for a while for sure, but I believe you can already build some apps with it, bearing in mind possible breaking changes and risks. I try to avoid changing API and most changes right now are aimed at core stability, but still can't guarantee that next release won't break your app.

If you go carefully with it, should be okay. Many people are already using it