Finally gave it a run myself.
Graphics wise, demos usually aren't as good as the final game. Mass Effect 3's demo looks pretty average but the final game looks great for instance. But outside of textures and lighting, the animations were really jumpy and it has "BioWare syndrome" where they assume everyone is playing this on a goddamn movie theater screen so the text is basically unreadable to anyone with an average sized TV.
Controls, the game's very ambitious by trying to have (what I thought they advertised) Devil May Cry meets Shadow of the Colossus combat meets The Elder Scrolls but that kinda screws up the button mapping. I'd probably get used to it after a while. The tutorial was really shitty since I didn't even know you had access to special moves and could climb shit until the second demo.
Gameplay seems ambitious and I can see the influences they've been noting. I think it's pretty positive in terms of combat and stuff but I really don't know about the open world stuff since they put like no emphasis on it. I'm surprised they didn't take the route of Kingdoms of Amalur or Crackdown 2 in terms of demos and give you a set amount of time to explore the world.
Overall it's something on my to-buy list when it becomes rather inexpensive, like I'd say around $20-$30.