Okay...
This game did, as others said, have a good concept behind it, but it obviously was not checked for many bugs. Ambient sounds from jumping and stealth are indeed distracting, and visuals are somewhat muddled by shadows. Game is difficult in some cases, which is a good thing, but difficulties are inconsistent and often catch the player by surprise. For surprises, reflexes are key, and this character has none. Also, something that no one else has mentioned: Death by falling has yet to occur. I began this when I fell off a platform on level 3, and I am still falling through a purple abyss ten minutes later. Keep the game boxed in instead of letting someone fall forever and making them restart the entire game.
Still, better than some other stuff I've seen here. 6/10, and a 3/5.