While the mechanics and the innovation in use of darkness and light is very cool as is the use of music for the current detection phase (which the soundtrack is really good btw), I can't really say I recommend this first entry that much.

The levels get way too repetitive, a lot of them have really icky design, game over if you knock out/kill a random unclear keypad guard, path to progress can be really hidden or obtuse, the game map is useless if it is even available, machine gun sentries are placed in unavoidable paths and many other problems.

The story only gets kinda interesting in the last 3 levels and there are some really garbage levels.