What are you considering “bugs” ? Things like wavedashing or spikejumps ?

To me they are clearly not bugs. They are at best here by design, at worst emergent gameplay. And an amazing emergent gameplay ! It is clear, as you said some collectibles from the game can only be obtained this way. They clearly knew what they were doing when creating this.

(Yes this is my favorite game of all time, I’m a bit touchy sorry :p !)