Thanks! Yeah, building up the achievements was definitely a key idea, and we’re pretty happy with how it turned out. Well done on the final boss, and glad you found it to be well-tuned!
Our jump physics, although overall far from perfect, did have some concepts built-in to make them feel a bit better. There is a few frames of jump buffering, as you noticed, and also a few frames after running off the edge that you can still jump (“coyote time”). Glad you appreciated them!