Few simple things that need changing which will improve it massively!

Allow for spearmen to run on double click like you can do with archers! They only run if being sent to attack something.

Bring up trade panel when market is clicked!!! PLEASE!!! very annoying, and it actually says you can do it in the help section of the game.

This has been said a lot before, but Stair cases need to be placed parallel to the wall!

Range of sight larger when in the dark. Military mission 7 made me notice this. You could have spearmen stood a few meters from a catapult attacking the walls yet they or myself couldn't see it and took me some time to find it. Meaning no wall left!

More free build maps is a must!

Multiple invasions at once!

Brazier cost to much! Plus can't be placed on towers/gatehouse!

When placing buildings over long terrain such as the inn, the grass still shows through the floor. Not good!