Damn, I need to push the tutorial change ASAP, especially since even fishking was confused too.
The shielded enemies go down to anything but direct shooting and kicks, and the preferred method is a parry.
I agree on the wall jump. Before you had to hold key away from the wall, which made sense for me (as a Super Metroid fan) but lots of people didn't like it. You actually can still do it this way, it's just tighter with the range.
Thanks for the video! Those are always helpful.