Ahoi! First of all, wonderful game you've got here! Absolutely loving it!
However, there does seem to be a small issue with the players running.
So holding the run button seems to not allow me to fire my guns... sometimes...

It seems very fickle, but sometimes I'll run and my guns won't fire at all,
and sometimes I'll run and I only can't fire the alts for the weapons.
Quite strange.

I been getting slowdown in most of the Episode 3 levels, and maybe some of the later episode 2 levels. i'm not sure how to be more helpful with my description. i have been playing on Subjugator if that helps.

I would give more information but i kind of trained myself to ignore it, but then i thought -oh shit, i should probz report this just in case.
maybe i could go back and play again? Subjugator is hard tho

I think starting at episode 3 the game sometimes crashes when saving, later it crashes on every save or quick save. Happily the save file is always there after restart. I'm using Windows 10 and the version 1808 but played the version before with the same save files. Crashing means the game closes immediately without a message.

I played it through and it was very smooth. The level design was extremely creative and never unfair and well balanced. I never got stuck in the walls or anything like that, the controls are very precise. What I found is hardly worth mentioning...

In E1M3 I saw a gap under a path, looking out of a chamber that was blocked by a stone:

In E5M3 you walk at the top of the glass roof where the red key is against the invisible level wall. It was probably intentional, but a high fence would be better and the direct view of the entire skybox is not advantageous either:

Also in E5M3 there were two floating boxes outside the water (there is water on the right, not in screen):

For stairs, it would be nicer if the pattern matched the height of the steps so that each step looks the same. It's close but usually doesn't quite fit:

Here's one I've forgotten to address: when you grab the invisibility powerup and throw dynamite one by one constantly, you can keep throwing dynamite as its ammo counter reaches negative values. This only happens in primary fire and not secondary.

I found a bug in which doors can open up by the contact of grenade or the wrench tool hitting them, which I don't think should be doing that.

After the wake up animation, the POV remains slighty tilted and doesn't change. Surprised this bug hasn't already been fixed.

Found a missing texture in the first level in the teleporter room (there's a wall on the other side):

and in the same level, there's a weird geomtetry displacement that wasn't there before:

Also, dunno if it's a bug too, but I wanted to experiment with making a map recreating the famous "Into The Abyss" level from Titanfall 2, and run in this effect in which the other side of the mesh becomes traslucent for no reason when it isn't supposed to do that:

I wanted to get below 1 minute for E1M1 so I played the game bit different than before and recognized this:

I have run toggled on, then after falling in E1M1 I crouch into the ventilation shaft. When I'm into it I cannot kick with fire-key, I see the crosshair wobbling but nothing happens, only the kick key Q works. Behind the shaft, when standing, the kick works again with fire-key or Q.

Found some misaligned tiles and voids in the early levels:

Also found this weird visual glitch in which the flame brute shines like he's invisible:

In E5M3, there is a slight misalignment in the vent near that malfunctioning laser cannon

When quicksaving often, the saving process seems to slow down with every save until the game crashes. I now have a quicksave file which I can load but not save again from that point. It's the slot0.sav and it is 17194 KB big. It's from E2M3 but I think it can happen in every map.

I tested gamepad support in 1892. I'm not a gamepad player but I can give you some feedback for that. I'm sure you are making many couch players very happy with that functionality.

For the moment I still see some work to do. It's not always picking the right controller.

I'm using (newest gen) XBox Controller and have two paired, but only one was connected ("switched on")  and I had NO working gamepad in the game. Second try I connected both controllers and the other which was switched off before worked. Next time I started the game, the other one worked.

I think it is complety ok to automatically pick one controller if more than one is connected but you seem to pick just "controller 0" if it is connected or not.  I'm not sure how a connection is detected but the axis should have valued around 32k when on and 0 if off.

Another problem is with looking, it is splitted between the wrong axis on the right stick and the trigger buttons:

right stick up looks to the left
right stick down looks to the right
left trigger looks down
right trigger looks up

So for the moment I cannot test how it really feels in the gameplay but I will do that, when the axis are fixed.

ı finded some colorless walls in custom maps and ı find white question marks. And two question marks are standing halfway on the floor.

slight animation bug when raising the tripmine after using it or after equipping it where the tripmine kind of adjusts to the arm/hand after the animation is done which is weird

if it doesn't happen then try this
resolution = 640x480

FOV = 90

i got the It's Mine Now! steam achievement while i was alt-tabbed from the main menu for like 30 minutes, lol.

Can't save game when not running as Admin (Win 10 64 bit, Itch version).

If anyone has trouble saving their settings or saving the game's progress, running the app with administrator privileges might be the fix.
I usually don't encounter this sort of issue, as I run a rather lose Windows security setting, and was doubly surprised as the game was also not installed in a protected file system. But oh well. Just something to be aware of I guess.

Otherwise having a great time!

Crouching with the default Ctrl bind does not work - I've had to set it to LCtrl instead. Perhaps it has something to do with my keyboard? (playing on an Acer Predator Helios 16 laptop)

The game appears to lack high DPI-awareness - my Windows display scale is set to 150%, and the game window was slightly blurry until I enabled the application DPI scaling compatibility option in Zortch.exe.

Two small issues next to each other in e5m1, in the red key room

Texture seam

Z fighting where the crosshair is