I've been tweaking some stuff based on playtester feedback. A lot of it doesn't display well in screenshots, though. One thing I've done is tweak the grapple physics so that you do not lose any speed while swinging in zero gravity. I also added some zoom zoom lines when going fast -- this enhances the sense of speed a bit and also communicates which direction you're moving, which is helpful in zero g.
Here's a webm showing it off:
If you notice, I let go too early and had to correct my trajectory as I went back indoors, which lost me some speed -- but if you're skilled enough with the grapple, you'll be able to get practically anywhere without any loss.
Here's a few more screenshots from the last playtest: