Hey,
Thank you. I am glad that you enjoy FlowCanvas! 🙂
FlowCanvas is hosted on GitLab alongside NodeCanvas in the same repo (since they use the same framework). I was already planning the possibility to give access to the repo to people who already own both (since they are on the same repo) in the future.
With that said and considered, if you guys want access to the repo, please do send me an email (support_AT_paradoxnotion.com) with your email for invitation.