It is feedback time once more! I'm gonna try and focus on some more "nitpicky" or smaller issues now, so bear with me lol
Clipping - It's generally good practice to have smoother clipping with ramps. Players don't really pay attention to how high they are up in relation to the stairs themselves unless it's drastically different, so having a smoother ramp followed by flat ground would work wonders here. It also just leads to more fluid combat.
Clipping - More of the same from the previous fb, just something I find important.
Pickups - I think you could afford to size this pack up that's in front of the Control Point. It's in a risky enough spot where if you're playing around there you could definitely try your luck at grabbing some ammo there, and it's in a place that still wouldn't encourage Engineers to get too pushy with their building placement unless they already have a big advantage over the other team.
Detailing Suggestion - This looks like it's shaping up to be a sort of observation deck kind of area? Like a bunch of BLU SpyTech stuff inside this upper bit of the area would be a really cool touch.
Detailing Suggestion - I think it would be a good idea to try and telegraph that this is a no-fly zone somehow. This can often be done by just making a building taller, but I get the feeling it wouldn't come out right give then area is indoors. I think you could maybe take a more subtle approach, and have some catwalks here perhaps? It gets the idea across that the area is out of bounds, since maps like gorge have those up high in their indoor areas.
Clipping - These metal pipes are fully clipped, however the roof right next to them is not. It would present a camping problem if that roof were walkable, so I think you should just make the pipes non-solid.
Gameplay - The whole area to the right of the red line is a huge hiding spot for players and I'm just gonna be honest that shit is the most infuriating thing to fight against in TF2 right next to the Wrangler. If there's some way that the hidey spot could be organically removed, that would be most appreciated.
Detailing Suggestion - Call me a bit silly if you want but I think you could introduce some hydro theming into this map maybe? For example, you could have a large puddle of water here and have a dam right behind it serving as the out of bounds wall.
Bugfix - You have some weird z-fighting error going on here? Not sure what's cause it but hey, bugfix is a bugfix!
Detailing Suggestion - Continuing from a previous suggestion, maybe you could make the outer areas of mid have some huge hydro station-like things around it? I'm thinking maps like tc_hydro (duh) but also something like ctf_vector perhaps? Would be worth looking into
imo.
Detailing Suggestion - I absolutely adore this skylight in the map but imo I think it would be cool to have something more than just these "bumps" at the top of the map too. There's this one prop on Hydro's RED last that I think would be really cool but I cannot for the life of me remember the name.
Clipping - I really dig the detail right here of an extra stripe on the floor, I think it's cool, but I also think it could be de-clipped. It just adds an extra hump in height which messes with aiming a bit. So like, the detail itself stays the same, it's just that it's a non-solid brush.
Detailing Suggestion - I don't think these planks should be team-coloured. I think using some of the construction wood textures from the
Construction Pack would be really nice for it! (If you need some better visuals, look at cp_vanguard)
Pickups - I think this health kit should be raised to a medium HP kit to reflect its location in the map. You always want some good health to fall back to if things get ugly, and this imo is the perfect spot for a medium HP kit. Keep the ammo kit here as a small one. Also, please make the patches overlays!!!!

Would also be worth considering moving hp/ammo closer together but that's up to you.
Bugfix - This crate texture appears fully black for some reason. Dunno if it's a bug but if it is, maybe add some artificial, invisible light?
Clipping - Please make these little lip... things highlighted in red non-solid. Like a previous comment, they add a bit of extra height in the middle of a fight which is just a big no-no.
Pickups -
grmble grmble grmble I guess it's FINE it's not in the main play area so it doesn't have any real significance on the fights it's just WEIRD (this is a joke, it's probably fine. Just needed a bit of reprieve from reviewing the map for 2 hours lol)
Detailing Suggestion - Overlays, overlays, overlays! Please put overlays under this lil guy...
I think that finally wraps it up for my feedback on koth_epiphany_b1! It took 2 hours to really digest it all, but I think once some of this is implemented you will have an even
higher-quality map under your wing! I am really, really looking forward to Beta 2 and onward, I have adored this map so far and I'm excited for its future!!!!!!