I just played through the demo a couple of times for the first time.
Major issues:
At one point I could spot an enemy through walls. I had a 0% chance to hit though. (I reported this via the in-game report tool as well.) Screenshot here https://imgur.com/a/VAaqr
Many times my shots where blocked by cover which didn't look like it could possibly be in the way. The last of the screenshots shows an especially egregious case where the edge of the plateau the soldier is standing on is blocking the shot https://imgur.com/a/2WrL9
Other feedback:
The game looks great! Graphics and animations are on point, it plays pretty well, it's stable. Great work!
Zooming! I want to look closer at all this beauty, and be able to get a nice overview.
Spotting an alien while moving does not stop/cancel movement. Please make it so it does.
The dense map filled with trees and rocks looks great, but all the cover is a pain to try to get a clear shot through. Most of the Xen1 maps were much more sparse which worked better.
A tiny tree being impenetrable by machine gun fire and granting 40% cover is just annoying.
The combined shot select/reserve is a good idea but the current UI implementation is super-unintuitive. I thought reserving was broken until I read the forum post. (A radio button for reserving might make sense.)
With the spiffy new rotational camera having a compass or minimap becomes important.
I've always wished my soldiers could walk past each other. It would make fighting indoors way less of a hassle.
