Probably not unfortunately since there is a paid version. My other app FamiStudio is open source, you can check that out.
maybe a source available licence like aseprite? that restricts people from sharing binaries but allows the source code to be viewed and contributed to? so you can still sell the binary as a product and not allow others to redistribute your software under copyright?
if not i completely understand, and i love the work you are doing, this program is amazing and i cant sing its praises enough.