Great demo. I feel like any face button should be usable for guarding rather than just the strategize button. And I might have been wrong, but it looked like when enemies targeted multiple team members, only one of them actually guarded.
And one more thing, this might be a pet peeve, but there's a pause between battle menus navigating and being able to select the next option. I often click early and it gives the illusion that my input was just getting dropped. I'd recommend making the pause shorter, or if it has to wait for the menu to load, maybe put in a short buffer time.