I wouldn't say is a mod but rather a total conversion or even standalone GZDoom game.
The gameplay kinda feels like Duke Nukem 3D and Strife actually. They made use of many advanced GZDoom features borrowed from Build Engine such as destructibe terrain, mirrors, rooms over rooms, portals etc.. So it doesn't feel so much like a standard Doom game.
There are 3 episodes (and a 4th one is in the works but not out yet). All episodes have overlap in terms of enemies, weapons, story but they are a bit different.
Having played them all this is my personal impression of the different episodes:
-Ashes 2063 / Enriched this is the original game which became first episode. You get the motorcycle early on, features towns and has less of a hub feel. The game is more story focused but also feels like it has some mini hub areas but overall there is a linear progression.
-Afterglow is very long with different hub areas and can be grindy at times. You finish one hub then move to the next. It plays most like Strife. The ending is very good! Some levels are really good design too.
-Hard Reset which is the last one to be released in 2024 is shorter but has very unique mechanics on how weapons are upgraded and more linear and story focused as well as some unique enemies. This one is a bit more horror themed and very weird sometimes.
The game world feels like Fallout but the story is unique and I would say more inspired by Stalker game.
Weapons are pretty standard shotgun, machine gun, sniper rife, pistols etc. What is cool is weapon mods and the fact that you have have multiple weapons of the same type in 1 slot. You have work benches to mod your weapons damn good. Hard Reset goes even harder you can only do some upgrades by finding the right people.
You have ability to use some vehicles, talk to people and solve quests or puzzles in different ways, explore the world etc.
