Awesome. I'm really digging this software.
Just an idea of what would be cool is if you could also export the basic GDscript code for the particles as well. That way we could cut and paste into our own code the basic parameters of what we've just created. (Don't worry, no good deed goes unpunished. If you were to do this people would then jump up and down about how they wanted their code to be used in a nested if statement and now the indentation doesn't work)