Hi Ed!
Good to see the project advance. Do you already have a schedule for the next release?
Some observations of the door feature:
<<If an unknown enemy is behind a door, the player will be allowed to try to open the door. The enemy becomes visible after trying to open>>
IMHO the visibility of the enemy is in conflict with the fog of war that the game sticks to. Making the enemy visible allows a player to see the weapons the enemy is carrying and in what direction the enemy is looking. This could allow a player to attack from another angle without taking the risk of being interrupted.
Suggestion: When trying to open a door, there could be just a message telling "The door is blocked". So it is up to the player to decide if it worth the risk to take a look inside that building from another door or window.
In the video when the AI moves you can see doors opening and closing that apparently are out of view. Those movements should remain invisible unless there is line of sight.
Kind regards!
Peter