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data/EnemyExtra.json
Do you have a template for that?
Hello!
If you know your way around JSON files, you can find a description of the file structure in the help section, and an example within my sample project (available here on itch). If not, you can change the "Datasource Type" parameter value to "Plugin Manager", and use the "Plugin Manager Data" to setup your enemy levels without the need to meddle around JSON files =]