Just played in the Highlander lobby. Over all, it was great, but here are some suggestions:
-Please for the love of god add some color. I know its only alpha but I had no idea where to go occasionally and that would really help. Also signs.
-Even though it wasn't a super big problem in my match, that's one awfully big sightline across mid. I don't really know you to fix it, but maybe you will think of something.
-Some sort of water element around the place in between mid and spawn would be cool, if you plan on keeping the health packs where they are. pyros felt sort of OP, and it would also add some variation between areas.
-Lastly, a lot of the stairs/ramps felt really steep. if you could make them less angled, that would be awesome.
Overall really awesome map, and I look forward to seeing it progress!
edit: also, how did you get your map put up in tf2lobby? im about to release a koth map designed partially for 6's and I want to test there.