Nice editor, the features I like especially are the scripting options and the fact it has a runtime already to test with. This has a lot of potential especially with a .js engine that could wire into other .js game engines.
UI is fast and easy to use. It took a bit to see how processing nodes work. I can see how a full game could be built in this.
One issue I tried to export to json all the output files were the same.
[object Object]
I think a stringify was missing.