Thanks for trying the game. The cape effect is pretty much the tutorial wave shader but applied along a curve so that more "wave" is applied further from the head position and then scale by the player speed. I through it in on the final day because they looked to static then the rest is just lazy scale animation in engine.
I wanted to do nice cloth animations in blender but I'm veryyyyy new to 3D art so I couldn't figure out how to rig the cloak correctly to animate it.