Most likely, this level is the same as a DWANG4M8 that a quick Google search would reveal was inspired by an old Doom II map (similar to Welcome to dogget 1.1). Of course, we don't get any of these details in this level as no readme is included (nor a name beyond the filename). As I assume the version I saw in the Google search is a slightly different version to what we see here, that means I have not put up such info on the Wikia (especially since I am not confirming that they are the same at this time).
This level is extremely simplistic, being very symmetrical in design. In fact, the main way to determine your positioning is by using a bug that appears when restarting the level (one of the Rockets falls through the map, meaning that corridor looks different from the other sides). Beyond the aforementioned corridors, where most of the weaponry is contained, there is a room in the middle interconnecting the four corridors. The room is segmented by walls, creating an exterior and interior section.
The middle of the map has a Grenade Launcher, though that weapon isn't exactly desirable due to the Rocket Launchers that are found in each corridor as well as the openness of the map. The walls of the interior section allow some protection against the Rocket Launchers, though as usual in these style of levels that weapon remains dominant. Each corridor also has a Super Nailgun, pointless when a better weapon exists in such close proximity. Ammo is not an issue in this map, they are spread rather generously in the corridors. We have some Double-Barrelled Shotguns in the exterior section of the central room, though they are rather useless due to the openness of the map. All 25 Health are found in the central room, plus it serves as a good control point to see almost every location in the map.
This map might work in a pinch as a 2-4 player map where everyone focuses on the Rocket Launchers. Of course, the spawn location setup means that the controlling player would get plenty of kills before they even got opposition as long as they are aware of the corridors. This map isn't terrible, though I would like a greater amount of variety, though there isn't exactly anything of real interest to be found here.