Grimrock

In one of the notes we can read
"...Our client insists on continuing the mission. But he absolutely refuses to start in the daytime. He says we must attack under the cover of the night..."
try to search the village of keepers at night

Keeper´s village - consider putting some warning text (print, walltext sign etc.) before entering the secret area guarded by 2 ice ghosts in western part of the map. The fight is almost impossible to survive within such early phase of the game. I had to return here much later to be able to handle it.

Love the 4 season areas, really nice level designs and tricky difficulty (especially the Summer level as well as Winter level where it was pretty hard not to be trapped in dead end when receding from monsters ). Autumn and Spring areas are quite easy though - why there are blockers for monsters put in multiple places? Is that intentional?
Possible bug - the fire blobs in Summer level are continuously healing when wandering through fire squares (even before the first battle contact) and not just healing, it seems like the HP is increasing excessively over the intended value. It leads to very long and tiresome fights with them.

I would expect the surprising hanging chain balls in Underground mines doing much more damage to the group. Also when any of the balls is triggered there is a regarding console warning displayed with every game save attempt since.

The path of the martyr - very original area, kudos. The first wizard fight seems like the toughest fight in the whole MOD (I played with summoning zombies, still not applied your later fix). I died there once until I figured out a suitable tactics.

Final fight is not so tough as one would expect, it´s rather lenghty. Consider spawning additional monsters or similar trick which can increase difficulty.

Lastly, from my adventure progress I could say that the amount of healing mushrooms (for healing potions) and food supplies are very well balanced. Also to my tactics - I used invisibility and forcefield spell a lot. This helped progressing through multiple monster fights.