This is fantastic - potentially a really useful tool! I could definitely see myself using this in the future. It's also quite fun to play around with :)
I had a couple of requests though (maybe these are already in and I missed them):
- Batch processing options (e.g. apply a filter you've created to all images in a folder)
- Automatically create an input node for things like numbers when you drag from an input onto an empty space
- How do you delete a node?