A bit to dark for me, but the idea is unique and interesting.
The graphics has this dark dungeon feel to it (of course, since you are in a dungeon). But that gets tiring for me, it to much like quake 1 or doom - which I didn't like that much when I was younger. Perhaps I would still play this game if it wasn't so dark.. Maybe the foundation of the ball-control would fit better into a type of childrens game with happy colours and positive feedback being the main motivation - not fear.
I would recommend this game to anyone who liked the dark feel of for example Quake 1 or Doom 1 and now want to try something unique and a bit more mind challenging.