1a- Build over walls (it's so sad to see the main keep burrowed under the tall walls)

1b- Elevate building option (alternative to build over walls, instead of destroing the building, building the walls and rebuilding the same over them, simply click and watch the magic happen)

1c- Raise ground option (which could be used to make a mound, or need to rest along a wall/pallicade to be built) different from wall, doesn't stop enemy units

1d- One way to nerf the wall (why am I even suggesting this?) walls upon being destroyed make ramps of rubble (in which the vikings can use to climb over walls)

2- mergeable archer towers (either to become 2x2/3x3 big towers or continuous roofs over walls )

3- THICC bridges (merge with surronding bridges like some roads do)

4- bigger rendering distance