Thanks! Celeste was a huge inspiration for the player movement, the visuals less so. I ended up with a tiny red-haired protagonist a bit by accident :^).
The wall jump definitely was a bit of a struggle for me to implement, it wasn't easy to design it so that it feels good but doesn't make scaling walls trivial. The wall slide animation not having any transition from other animations also makes it feel less smooth. Addressing that probably would help a lot in making it feel better, even without tweaking numbers. Thank you for the feedback!