The license - if any - would simply state “feel free to use it in and modify for your game, just credit me”
I’ve deliberately made the plug-in barebones even down to the graphics, so that people can customize it to fit their games - including persistent variable support.
I don’t mind it being in your blog. In fact, you’ve made it easier for Japanese developers to work with my plugin (including your modifications) now that they have documentation for it in their native language, so I support this.
TL;DR - I support this, thank you.