I'm not playing a lot of games like that one, and thus considers myself as very bad at it, but that game is tragically problematic regarding the amount of content and the difficulty curves going with it, forcing you to redo the same area over and over again to augment your stats and be able to progress without being one or two shots.
The key mapping is a nightmare, especially if you're not using a QWERTY or are used to the basic WASD commands as you have to use the arrows and the skills / spells are spread on the last rows of a QWERTY keyboard keys. There is of course no way to change that.
The collision system is what had me dying the most, once you'll be able to go through an item (for example those little dartboard, but don't you ever try to go up to it or you'll get locked, see those columns ? They aren't standing, instead laying down on the floor and you have to avoid them (while of course the enemies can go through them) and as soon as you reach the area after the prison, even the max speed is the same as the speed of the enemies, add the fact that you keep getting stuck as if you dare to touch a column, you cannot move to the left or right and need to go up or down, and you'll get a perfectly enervating situation and get you to not want to continue farming that damn prison again and again (replayability ? 0) for the same problem to keep happening.