Grimrock

I played the first one and had fun but would have liked the mobs to be random and not preset. Are the mobs in part 2 the same as 1 or are they random. And do they respawn or once killed they don't come back?

There is very little randomization in Grimrock 2's dungeon, same as in Grimrock 1. Also like in Grimrock 1, there are hidden floor triggers that (re)spawn some monsters, but unlike Grimrock 1 they are usually far away from the spawn point (often many levels away). They also generally have extremely long cooldowns.