This looks really similar to Hyperproduction[1], wondering if there's any connections or relation between the two projects?
If you would like to see some of the productions we put together, you can check out my dissertation here: https://ben.ai/research
Well, yes, ossia is initially based on a score paradigm, but our main dev @jcelerier added a node-base system recently, which kind of turns it to a node/patching system for mapping and interconnection. However, as I said, we don't nearly have such a variety of processing blocks yet - there is a clear API to make new ones, though.
For those interested in such mappings systems, there is also http://libmapper.github.io/ that might be of some interest...