No need to be sorry. If you could let me know or show me where exactly there is that "square default texture" I'd be grateful, since I never receive a single report about anything like that.
About the "(Not Available yet)" in options clearly shown in the main menu: they're there becaue that's the main menu for the Game not just the Arena, that's why, to avoid people asking "Why can't I access XXX option?" we added that text to it, just to avoid confusion. That was just a matter of stuff that happened over the development of the Arena. It wasn't specified in here but if you saw this same version a year ago, you maybe saw the ending and credits and post-credit scene it had, basically showing it was finished. That is assuming you played it, otherwise my bad.
But yeah, it's finished😊