I know I'm late to the Grimrock party, but I fired up this puppy as my next backlog project and I love this game!
I'm just starting level 8. I have a Mino Warrior using maces, a human warrior using martial arts (bare hands, lol), and in the back row is my axe/shuriken throwing Rogue and a Frost focused Mage with most points in Spellcraft.
I love the combat and the generally intelligent puzzles. The only thing I do not care for are puzzles that require you to use specific weapons to proceed.
The two that come to mind needed special swords to solve, but since I don't have a swordsman I had no need for those objects and left them behind like all the other stuff I can't use so as not to be over burdened. The puzzles themselves give no clue that I needed to have those items.
Other than that I have no complaints. The graphics are great, and the sound effects are perfectly eerie. So far, LoG is one of my favorite PC romps in a few years. Easily worth more than the $5 or so I picked it up for. I'll pay up to $30 day one for the sequel.