Hi, I have a small problem.
IN the first level, how do you climb up ladders?
I know it sounds like a simple and dumb question, but i tried looking in the controls for it and didnt see anything, so if anyone could help, I'd greatly appreciate it.

Just HOLD the jump/crouch button to climb up and down without pressing more times. :)

Yep like the last poster said, that is how you do it properly (holding the jump button instead of pressing it repeatedly). The first time I played the game I was frustrated trying to climb ladders by hitting jump a thousand times and eventually, very slowly, i would make it up them. I figured it was a bug for sure and it never occurred to me to hold it for the longest time!