I did all assets myself and also mixed all the sounds that I gave in the description.
Honestly, I also struggled with wall jumps sometimes. I wanted to implement jump buffering to make wall jumps more responsive but didn't have time for it. It probably could've really helped though. You can at least wall jump on a single wall without any problems if you keep bouncing of off the other one like this
I will post a patch without the particle stuttering and wall jumping issues after the voting period.
Really appreciate your feedback, cheers!