Starting off, the dialogues/conversations were nice and easy to understand. The story was easy to understand which made the game more immersing. However the narrator's voice, how he speaks was just very annoying.
Even though its somewhat open world, there were a lot of times where the path/direction where I need to go to is not obvious. Especially in the forest, everything was black and there were trees everywhere. This has a good side and bad side; good side is players will explore the game environment more and can discover more features, the bad side is it could lead to players to get lost inside the game. Getting lost sometimes inside the game is normal especially for open worlds but getting lost frequently or for a long time and not finding the objective could disheartened some players to continue the game.
Questionable HUD. At the start of the game, where new players might still not be familiar with the mechanics of movement (or flying as the game refers to it), the crosshair is a big confusion. At first I thought it was the basis for direction of movement. I was looking up when I want to fly, looking right when I want to go to the right, and so on but I was moving at a different direction. It took me quite a lot of time to realize the controllers were the basis for direction of movement, and the crosshair were basically of no use. Aside from that, there was a moving bar on the lower left quadrant of the crosshair which I first thought is a guide to the objective but it wasn't and I still don't know what was the use of it. The heartbeat UI also, I wasn't sure what was the use of it and it was too big at the center of the screen.
Mini-game (shooting anti-viruses). It was a fun mini-game but the anti-viruses were coming quickly so I have to move my head (crosshair) quickly which made me dizzy and my neck a bit painful. Also, the radar/mini-map was out of place, it shouldn't be at the center. It distracts the focus from aiming the anti-viruses to looking at the mini-map and looking for the position of the anti-viruses. Aside from that, the anti-viruses on the mini-map were red and the actual anti-viruses were also red so it was confusing which one to aim for.
So far that was my experience on playing the demo. The story was actually really immersing so I want to know more and how it ends.