i'm liking this very much.
but before you stop working on the climbing/running/crawling/jumping/grabbing part, i have just one more suggestion. it's not actually a problem, it's more of a personal preference, but i think that when you are hanging from a ledge and you press forward, the character should climb up all the way, even if you release the key, instead of going back down...

but over all, it's coming along very well...

abraço,
Filipe