Oh one final thing if you don't like the air control thing maybe add a different way to conserve momentum other than the grapple gun (which again doesn't work in tight spaces.) here are some examples:
while crouch sliding you can use the A/D keys to lean and turn.
when landing while crouching the momentum is spun towards where the player is looking. (krunker.io does something similar to this)
you always have a mini grapple hook bound to mouse 2 that also works as the "pick up object" button when unarmed
oh yea and on a separate note sky 2 has a wall jump section in the beginning that you cant do without jumping on top of the wall . (maybe someone found a way?)