I don't think it is too easy, I think it's just about right.
I played through on hard and there were sections (before the flamethrower) where I died a lot to the alien, didn't get the 100 times though.
Yes once you had figured out a few things it was easier to stay alive, but I think that was a good time.
I think what may have happened is that you got used to dieing, as soon as that starts being part of the learning curve/experience you stop thinking of it as a difficulty thing.
I also found because of the AI luck became an important factor, sometimes I would get lucky and have an easy time, other times I'd be unlucky several times in a row.
One thing was that I felt I got way too much ammo and parts, I never went below about 300 flame fuel and I was maxed out on craftables almost the whole game, although I didn't explore pretty much everywhere.