Well after all these years i sat down and finished this thing
Thoughts:

Very well made clearly, very few occasional jank like those bushes around the crystal in the lost forest.
Most puzzles are great, but a good portion of them is really obtuse. Not hard, or difficult, but really obtuse, could've been done better job with hints at close proximity to the puzzle and not a level away how it was in worst cases. Emperor's journey works well on paper as a puzzle but in reality turned out to be very janky to solve since you dont have the bird's eye view when solving. Walls could be replaced with grates for better visibility.

I really enjoyed new assets such as reworked vanilla items, items brought back from first grimrock and entirely new ones, such as fire gloves that turn your melee damage to fire, which is a concept not seen in vanilla game and that i really liked using.

Another criticism would be that you get all that good stuff towards the end, but you dont have anything to use it on left in the game, aside from maybe archers' woods, but even then, you get a full set of bombastic armor, which is great, but towards the end isnt that rewarding.

And one last thing would be the ending, which is really anticlimactic. Doing whole cinematic isnt mandatory for a good ending, you can just make a hallway with writings on the wall/NPC that pats u on the head and says good job basically.

Archer's woods level is also very nice, and tbh twin archer boss felt way more climactic than the mountain itself.

All in all very well made mod, if obtuse with puzzles occasionally.