Hi,
I'm not sure, what the colors are for while checking for covers ? I get that shield empty < half < full provides better cover, but i must admit i have trouble to really understand the colors (green, red...). I think it's because the spot gives cover by itself, but the current enemies can still reach me, but i'm not certain. Like being in the wrong side of a wall...
Also, not sure about line of sight in diagonals. Could you make a quick draw to explain covers and LoS ?
And, would it be possible to have, maybe as a new skill, the option to shot in a corridor while staying under cover ? Or if not able to shot, at least be able to have a look, Something like this from a quick search on internet pictures... Would be very handy to peek inside storage rooms, often guarded.