This is absolutely amazing and it's very generous of you to release a 'demo' like this. but I have 1 problem with the game right now.
The factions are not visually distinct enough from each other, so it's hard to tell people apart unless they are showing their patch, which they might not, or it might be blending in with their uniform, like lonely wolves.
Uniforms look good and distinctive under the bright light, like in the examples on their faction page, but you rarely see them so perfectly lit in the game.
I'm not suggesting you should brighten up the colors, I have something else in mind.
Look at the visual faction differences in the original Stalker games(stalker 2 sucks in this way, lol), every faction is different enough to have distinctly unique silhouettes - mercs have those huge vests with pockets, loners love their hoods, bandits always have someone wearing a long coat in their group, etc. And to top it off, they have unique walking animations - bandits are dragging their feet while slouched, duty keep their backs straight, loners always move holding their head low...
Add more personality to factions and they will become easier to tell apart.