Just finished the Demo, which is 4 stages and took me ~2h.
First, a word of warning: Massive Code Geass spoilers in the intro. If you're planning to watch that series please don't play the game before that.
Really neat presentation for the opening sequence, looks like they're taking some lessons from VNs and having more CGs for those sections. But other than that the intro stages didn't feel as strong as the VTX trilogy, though I liked it more than the ones from 30.
Looks like we're going with a pair of Mech+Battleship for protagonists again, and while I don't think the A.Advent looks as good as Dreisstrager it definitely feels more unique. I went with the female MC (Forte) and I liked her and the Lunedrache more than the 30 MC/Mech combo, but still far below the ones from VTX. As for other units, Dynazeon was a beast and was one-shotting enemies way too easily, and it was great to see Rising Gundam as a playable unit again.
The lack of SR points is disappointing as that was one of the last sources of challenge in recent games. Another thing to comment is that the demo doesn't feature any music from the anime series, so the OST feels more limited/repetitive than it should, but that's something that will change with the full game.