Alright, here are some bugs I noticed after messing around in the Sandbox for a while:
1) If you time it right, you can jump off the water before it kills you
2) Sometimes when I hang myself on a wall, I am unable to move sideways or vault over the top of the wall. I think it happens when I'm near the corner of the wall, but not sure.
3) Sometimes after a jump my character won't grab onto the wall at all - that might be purely my fault though, maybe I was too far away.
Also, do you plan on making the game slow and methodical or fast and about reflexes? Just curious, because the gameplay could support both of these ways.
Anyways, really good job, you're making a great progress with the game!