Contacted the author and it makes sense.
But then... I can't seem to be able to add anything to it from the Construct 2 script panel. I mean I usually click Add Action, then pick LocalStorage and then Set Value or Add value.
But I can't see it in the list of available actions...
Sorry if I sound dumb. I did this before, with other games, but all these won't allow me.
The author should reply soon, I'll try to update this post.
If you have any suggestion do not hesitate to answer. Thank you for your help!