Hey, I just wanted to congratulate you with a very impressive release, the software looks amazing, and I think I will give it a try pretty soon. A question: I see only subscription pricing; is a lifetime licence possible, or a licence like the way jetbrains does it (you pay for version, and maintain the right to keep using the version that was available when the license/subscrition expires, you can re-activate any time).
I'm particularly interested in this "field". I've build something similar many moons ago [1], in the same spirit, but much more primitive. I later started a company around an evolved idea, where the structure you sort of see in your screenshots is effectively a DAG with arbitrary depth (we didn't manage to release it unfortunately, complexity overtook us).
In any case, much congratulations + good luck with the launch!