...it's stated to be an original game, but if you take away all the custom assets then it's really no different then other Doom maps, just with having custom enemies and weapons.
Enemies that are a total ripoff of the original Doom 2 roster, by the way. Okay, i guess, you can have zobies in any game these days, but Age of Hell also has, revenants, cacodemons, pain elementals, lost souls, archviles, mancubi, pinkies, arachnotrons, cyberdemons, you name it. Bridgeburner is a fucking hack, he's basically trying to commercially sell a game with reskinned Doom enemies, that also runs on a Doom source port. This doesn't qualify as a total conversion to me.
Should i even comment on the gameplay and level design... it's so bad, even at first glance, in a 40 second trailer that's supposed to fool you that you're getting something good, and fails miserably. Let's start with the gameplay. It's not only slaughter, but it's the most boring type of slaughter. There's no attempt here at creating something a little more intricate than huge, open, flat, symmetrical arenas, where all you're going to do is circle strafe, spamming your most powerful weapon, while the monster horde is infighting, most likely in combat scenarios that will last for 5-10+ minutes at a time, like in a Sunder map, because Bridgeburner is a massive Insane Gazebo fanboy.
Then there's the symmetry, which makes everything looks so boring, not to mention that symmetry is also bad for gameplay, in fact, it's one of the biggest amateur mapping sins. The point of these maps is the "GRAND DESIGN", but with all these details, all this effort put into building it, the maps are boring to look at. Did i say effort? Scratch that, it's all copied and pasted details, so don't be fooled when you see a map of his with 150 thousand lines.
Take for example the bridge at 0:12 - you have a flat surface and the architectural elements are all copied and pasted repeatedly. Right after that you have a giant staircase at 0:15 - the arches with the pentagrams above and the spikes on top the building behind are all copy pasta. How about the arena on 0:21? The one that looks like you're on the inside of a green pumpkin... a big circle with copy pasted sloped columns all around and an needlesly overdetailed flat floor - no elevation whatsoever. And you can see why this is a problem in the last few seconds of the video, where you have a terrible circle strafe encounter with no other movement strategy.
All these glaring problems in just a 40 second trailer. Now imagine having to endure this boring chore for 10-20 hours and 30+ maps.
Just look at his Bastion of Chaos map layout and see for yourself how often he does these retarded circle shaped flat arenas with nothing but symmetrical copy pasted architecture:
https://doomwiki.org/w/images/9/97/Bastion_of_Chaos_map.png