Credit for making new content but this requires a lot of work.
There is nothing innovative or interesting about these layouts. They are either circles with a middle area, squares with a middle area, or bad mazes in cramped spaces.
There are 4 immediate glaring flaws that need to be addressed to make this better immediately.
1: Remove all the doors. The maps have so many doors. They destroy any sort of flow the map might have, and some maps might actually end up half decent if they didn't have doors. It's easy to confuse players where they are when there are many similar rooms with doors on every wall.
2: Clean up the items. There are so many items EVERYWHERE, it's very messy and becomes annoying when all you hear is the player picking up items. They are also completely unnecessary.
3: Objects in the way of movement need to go. There is no reason to have THINGS obstructing movement in maps that already obstruct movement via their very structuring.
4: Any map that is symmetrical, or nearly symmetrical, needs to go or be remade. Symmetrical maps are boring and realistically only offer half a map to the player.
Subjectively, the guns are the stupidest and ugliest guns I've ever seen. Reverting back to vanilla would be a massive improvement. Detail-wise, this is extremely plain, and attempts to let textures do all the work, which does not work. The whole wad reeks of early 2000s or late 1990s really.
This is an example of poor blocking line use. The player thinks they should be able to go here but can't.
Where the sky actually hurts you. It also pans poorly. It's also terrible game play, chucking a bunch of megaspheres in a map and a ton of cells is neither fun or good.
Example of symmetrical and extraordinarily boring layout
Example of a horrific layout
Not only are the rooms full of items but the hallways and pits too
Many instances of spawns facing walls which is entirely useless and detrimental to map flow and player happiness
In no world is this an appropriate part of any DM map. Sure you can say "There's an extra room in the north not shown here!" but it's so inconsequential it doesn't matter.
Boring. No real points to control, just keep to the side you spawn on and grab the soulsphere I guess.
It's nice you made new content, really. DM needs more of that. But this is only good for a single play with a couple people at most. There is nothing that would make me want to play it again. It uses a good texture pack in an extremely ugly way, the layouts are mostly disastrous, jank, boring and bad. The weapons are just horrific. It's pretty typical for a first time DM wad from someone who evidently doesn't play much (or any?) online DM. On the flipside, the only way to go from here is up. The potential is there but needs to be realized.