Not had a swing at 3D myself so it's hard to gauge, but it's still pretty impressive what you've managed so far. It's still a bit floaty and fiddly (like you have to be very careful on small platforms to not overshoot while climbing them), and it's lacking in feedback but refining that all comes with time.
If I'm right, you only wall slide if you're holding jump. I think it's be a lot more intuitive if you just have to push into it, since I was struggling to slide and would often wall jump by mistake when I let go of jump.
And I had this issue where the lighting made it hard to discern contours, so it was hard to tell the difference between holes and protrusions. At the start of my game I just jumped right into a hole! XD
I guess that's just the placeholder graphics.
Here's my recordings: