Here are some suggested areas:
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Testing with various WordPress versions. The plugin was developed on WordPress 5.4. It has not been tested with other versions.
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Installation of Vue.js app to database. Instead of adding files index.js and index.html, save their content to the database.
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Vue.js app as custom block. Ideally Vue.js apps would be available as custom blocks in the block editor.
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Vue.js app catalog. Some way to browse and explore installed Vue.js apps.
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Better parameter passing mechanism. It would be nice to have typed parameter values, and perhaps lists and hashes too.