the game pikununu has this system where the 2 legs are like spiders and actually step on object and these legs bend
im aware its to do with inverse kinematics but i havent found anywhere that gives some pointers on how to recreate this?
You just need to understand first what is inverse kinematics, and what you looking for is Foot IK, but for 2D character. So I guess that you can first watch a 3D inverse kinematic videos which is published on youtube (I have found one by searching, and result looked decent so I am also adding that video to here)
and after understanding how godot handles, you can surely start and port that 3D functionality to 2D, and if there is going to be something missing and that you want, you would just going to do that by yourself
p.s. you might also need to look for 2D skeletons:
and one example:
