I agree that as above, it is too difficult to get to certain places, the jumps need to be less precise, otherwise it lacks the needed playability. Overall, I'd give it a 4/5 for the ups, just fix the jumps a bit.
I finished the game finaly and I must say, it kept me playing. The gameplay was interesting enough to keep me going, however, I would like to see a few upgrades to the game overall, such as stated below, this should either be a horror survival or science fiction shooter. The items seemed lacking and inventory didn't have much use. What the game needs is variety in its items and armors and such, as well as a few other things. I would like to see alternate endings to this game, in the end it seems kind of pointless to survive if your character ends up insane, or dead. The storyline was good, graphics where great, and dificulty was decent. I'm giving it a 4/5