big jumps are all about the speed you move your feet, move your foot all the way up (hold up), then very quickly all the way down.
That's what I was doing, but it only gave me a little hop. I only got maybe 2/3 of the way across that spike pit.
The triggers don't seem to do anything at all for me.
Anyway, it seems I just wasn't moving the thumbsticks fast enough. Trying to use them just a little bit faster got me across the pit. I like this. It's sort of feels like a more accessible version of QWOP.
I don't really like the climbing, though. Its limbs don't always go in the direction I'm telling them to, as if they're being restricted somehow. That's a bit frustrating and I stopped playing when I came to another wall I was meant to climb, but other than that it's good.