click project > build archive
after that open you pixelbox folder project, search folder "distrib" you will see "build.zip"
that is the bundle of the game.
you can upload into itch.io or build into electron /nwjs
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An additional note about electron build:
It is possible to create an electron project of your game by clicking Project > Electron prebuild
This command will create an "electron" folder inside "distrib". In there, you'll find a readme file to guide you thru the Electron built itself (you'll have to `npm install` and `npm run build`).
If people also want a similar command for a NodeWebkit prebuild, please let me know ;)