First of all, there is already a Ruined Castle in the game, so I was hoping you could think of another name. Avoid Ruined Fort and Ruined Citadel as well please
.
Seems like a nice, small and very focused battle map. Maybe a bit on the small side, but we rarely pull of amazing numbers anyway these days. Not too friendly to cavalry, but eh. I do have some concerns about balance and some other points which I will illustrate with some great drawing.
First of all the red arrows show exits out of the castle. They got invisibru barriers but they don't look like you can't go through them. Of course people will learn this after the first playthrough, but it would be nice if you could physically block them off, because surprise invisible walls are always off putting.
The blue arrows display the ways up to the blue roof. Faction 1 has a little ladder at an angle which is going to make it very difficult to get up there whatsoever and especially before Faction 2, which has a very safe walkway that starts very close to the spawn. Clearly Faction 2 has much better access to the roof so without a doubt they will be controlling it, which will be quite a big deal if you ask me. Same thing with the green roof. Faction 2 can reach it much faster than Faction 1, making going up there virtually impossible for Faction 1. Allowing Faction 2's ranged to control both the green and blue roof.
The area I marked in yellow is not going to see much use whatsoever. The teams clash pretty much right in front of it, with little reason to go there. Maybe you should add a way to that area like presented by the yellow area. This would allow a bit more flanking and maneuvering than just the two ways, of which both are probably going to be bad news bears for Faction 1, while simultaneously increasing the player spread so it does not get too crowded.
In short I think Faction 2 has an advantageous position for area control and I think you should at least provide them much easier access to the blue roof. Give Faction 1 a little more love and this map is good to go as far as I am concerned. Oh, there is also the tower at Faction 2's spawn which might cause some late round camping and drawing out rounds, but the access staircase is big, so hopefully it will be okay.