Hey Mate. Thanks for your active involvement with testing and feedback, really appreciated.
Bad news: JSON debugger, I forgot to disable it before deploying.
Regarding particles, it could be an asset in the future, that would be reusable, and you will be able to transfer assets between projects too.
Regarding Spinner - what exactly you mean? Do you have reference examples?
Unused assets are not included in published builds. System identifies what is referenced and loads only that stuff (launcher is different).
In the future there will be option to say what you want to preload straight away, or maybe later on, so will be included in builds.
Resizing Hierarchy - thanks. Same thing happens with Assets panel
Adding collision component with rigidbody component, seems like not a bad idea at all.
Thanks for your feedback, we really appreciate that.