Composer Crimson Beyond A rather small slayer/ objective small team play. Halo 4: Custom Maps #16: Composer - YouTube
Looks somewhat like Sanctuary to me. Especially with the almost-donut and that very last part of the video. Ring is different, but that's not necessarily a good thing as the ring was a huge power position on the map. Right now, there doesn't seem to be an escape route from the middle.. Seems like it might Zealot syndrome. Have you tried moving the weapons away from the edges of the map?