Well I skipped all the narrative but I liked the demo overall, feels like you are almost there to have a fully fleshed out demo that shows what the game will be all about.
My main nitpick is with the AI, they don't seem to be aware of each other not even at a minimum level and their reaction time feels unnatural and artificial. I'm guessing that giving them more human-like behaviour is something you plan to do anyway, it's just that I wished that they got startled for a sec after I starting shooting them and I also haven't noticed them moving strategically to search for cover or anything and that would be pretty cool. Since you have different ranks of enemies it would be even cooler if the higher ups moved faster or reacted faster but at the moment it sort of feels that the AI just flipped the switch between idle and combat state which feels really artificial.
The other complain I mentioned was that they are not aware of each other because I blasted half of the squad of this guy with a grenade and the other half with a exploding barrel and he hasn't moved an inch.
Poor guy maybe he is traumatised.
Anyway not the grenade neither the barrel alerted the rest of the squad and that annoyed me, it's probably easy enough to make a noise system or shared senses system between nearby characters and that would go a long way towards making them act like a real squad.
But anyway, congrats on the demo it was quite more polished than I expected and sorry for skipping the story but I get really bored with warfare plots and whatnot.