I think you should directly upload to Pawngame when posting a map instead of imgur because there's a lot of unnecessary white space. I think that you should use corner tiles in the 4 corners of the map so the walls appear connected, also use end tiles where the concrete walls meet the 4-tiled green box (idk what to call it). I think that your map design meets your intended gameplay, and I think this is really great for your first creation. It also may be wise to indicate the spawn areas