Is the original Far Cry the same game as it was?

I recently bought the original Far Cry from Ubisoft for £2.50. I played it a couple of times back in the day, although my PC at the time struggled with it (I had to use cheats to finish it), so I thought at that price I’d try it with my super-duper new HP Omen. It’s nothing like I remember it. I tried it on ‘easy’ and I’m just being slaughtered at every turn. I couldn’t even get past the first stage without a YouTube assist. The very scenario is not as I remember. Is it a remake?