Square Enix launched a feedback survey for those who played Final Fantasy XV Episode Duscae. Luckily, only those who played the demo can share their thoughts as the website requires an activation code which can be found inside Type-0 cover. The survey is only for Pal territories at the moment.
http://eu.square-enix.com/en/ffxvsurvey/notin
I mentioned the difficulty balance issue. The powerful abilities shouldn't be available so easily (summon / The Phantom Swords) I suggested that those abilities should have their own bar.
I think many people are bother by the technical issues. Speak your minds directly to SE.
Nice move by SE.