Very good first base left, but just a few tips/ pointers. First, Arnk said that there should be few possible curves in the base, so try and keep the corners to 90 degrees. Second, your base has a unique design, but there shouldn't be and hallways that lead to nowhere, the first time I saw your base, it took me a couple of seconds to understand where the entrance was. The base should also stay to one tileset, 2 at the most. Finally your flagroom is well done, if anything I would keep that, but make sure that you follow Arnks guidelines, even if they are strict.