First things first: the art is fantastic. This was expected, since it's been done by Henk Nieborg. The game itself is pretty fun, although I find the controls a bit too convoluted for its own good, and the difficulty ramps up way too much.
This is not a game. This is a manual on how you do a remake. It's perfect: faithful to the original, but with updated graphics and controls, all done without betray the core of the original game or "adapting for modern sensibilities" (ugh). It's a work done with love and respect. The game in itself is fantastic, it looks phenomenal, has amazing map design, oozes atmosphere, it's got smart gameplay and just shows how bad game designing has become for our generation. It's also highly customizable in its difficulty, and this should be another example for modern developers. You can ease or make harder the combat or the puzzles or all of those things, you can fully customize your experience. Buy it, it's beyond awesome.