Here's my
battle on the map.
When I set it up, I wasn't a huge fan of the walls, as I felt they hindered access via that flanking route. However, there is a space on either side non-fliers could use.
The road is the most efficient means to reach the other side, but the road is vulnerable to the high ground on either side. I love that aspect of the map.
I played with slippery ice, and I think that probably hinders movement more than heavy snow would.
It's certainly a large map and really feels big when playing.