Well this is so far the first Unreal dungeon crawler I've played this jam so it's unique in that aspect. And while it looks great and there's a good amount of polish, I'll go over the issues I encountered first.
The first issue, which is probably mostly on me, is I couldn't figure out how to get past the second room. I had assumed that I used the yellow keycard to get into the second room (since the door going in was yellow), and thus wasn't required to actually drag and drop the keycard onto the doors. Once I figured that out I was good.
But on the subject of the rooms, it's a bit disorienting moving forward and suddenly teleporting. I assume this was done for performance reasons, which with Unreal is fair enough, though it caught me off guard at first. Oh and I ran into a bug where when going through the first yellow locked door, it teleported me back to the starting room. Had to run through it again to get to the first open area.
Like several of the other comments here I found something a bit off with the tile size and position. Some were definitely too small, like in the final boss room the camera clips into red columns. And others just felt awkward, like in the first room you're either too far away from lockers or have your face pressed against it. Just generally a bit weird. Oh I also discovered you can step onto objects, which isn't an issue and is kinda fun, but I wasn't sure if it was intentional or just an oversight.
The final boss was kinda neat, but again with the tile size issue it made it awkward to fight because it's hitbox is so small. And even though I beat the boss, I don't think I made it to the ending because I couldn't figure out where to go next. I searched through the boss arena and backtracked through other areas and didn't find anything. Is there no win screen?
Now covering the things I actually liked, graphically the game world looks great! The sparks coming off malfunctioning equipment, overflowing sinks, running showers, etc. all looked very nice. It chugged a bit on my machine even on low graphics, but I honestly think that's due more to some issue with my PC than the game itself because it's been a bit slow lately.
I liked finding all the little secrets scattered around, the blue and red stimpaks, and the toy weapons were all fun.
I appreciate the options of instant or continuous movement, I switched to instant as I found it a bit faster. Mind you my game has slow movement and no option for instant movement, so you got me beat there!
The combat was fine, I know others have mentioned it being too easy but in a jam I always prefer too easy over too hard. I assume there was a magic system planned but scrapped, since Intelligence and the blue bar don't do anything.
I also liked the interface, very intuitive, and I like the detail of leaning into crates when opening them. Very Legend of Grimrock!
Overall I had fun with this one. It has some obvious growing pains of devs who haven't made a dungeon crawler before, as you mentioned in other comments, but I think if you were to take another swing next year you could make something great!