Zen and Epic are two very different games, and so it's only appropriate for me to treat their updates differently. Zen will get daily updates as long as I'm working on it(Partially because the game is so damn buggy, xD) as opposed to the weekly updates Epic used to get.
https://dl.dropbox.com/u/8858375/epiccastle.map
That's the link to download the map you see in the video! We made this all in one day. To play the map, paste that file into the directory where your host files are saved.(Probably C:\Users\(you)\Documents\BYOND\MyHub\yutput\zen\bump survival)
Then edit the world-config.ini file in that folder so that 'map' is set to "epiccastle".
Then run the game, and it will load the map! :D
If you'd like to share your maps, feel free by posting them on the forum!