Cool game. That lava is SCARY! :)
Controls feel nice, after you get a hang of it.
Would be nice to get some feedback when the grapple is close enough to attach (like changing cursor shape). Sometimes I wasn't sure if I'm close enough to rock to grapple it, with 3d is sometimes hard to estimate distance accurately.
I didn't manage to complete lvl 2, I got to 3rd checkpoint but then a bit after that there was a point where I couldn't find a place where I could grapple higher.
Cheers!