Silent Debuggers is one of my all time favourite games period. They do a great job establishing the mood and make you feel... well, creepy right from the get-go. The story is pretty cool, though the Engrish could be a little better. Crank the volume on your stereo system and play it in a dark room. Had a lot of fun with this one.
As for finding it hard? It's actually one of the few games I've ever beat - EVER beat. I found it pretty easy, and I love the rush of "holy shit, I have to hurry up and get in the core before stuff blows up".
Tiger Road is garbage, however.
OD