Finished 1th and 2nd level on normal. The game is amazing. Is exactly like old Eye of Beholder and other SSI games.
I'm slightly dissapointed about the lack of races-classes. It seems very barebones. The races are too extreme. A very focused mage one, a very focused warrior one, a very focused rogue one and human of average-on-everything. It lack some middle-terms, some classes with minor special skills, giving more variety. Also, the races lack any kind of charisma (and the few portraits don't help).
Also, classes are too much focused. There is a single caster (that make any kind of magic) and the other classes are not able to cast anything. Maybe a more "clerical-like" class, like a warrior able to support a few support cast (making from cleric to paladin classes), and a rogue-warrior (with dual wield skills, but less variety of weapons or armor).
But those are the only complains (and I hope that later that thing can be fixed with mods), the game is pure old-school, but adapted to the new times. No random attribute points, the skill system is great, the puzzles are amazing and I love the use of torches.
The game is great, but I'm more hyped by the engine and the next modifications (for example, with new game the only dungeon avaliable is Grimrock, but there is a selector to choose from other official dungeons and user-made ones) than the game itself.