Hi Firflirch! Thanks again for checking out the project and taking time to write a post.
I tried no double jump at the very beginning of development and it definitely felt like something was missing, but the game has come a long way since including a glide, so maybe it's worth trying something again.
I might try slowing the horizontal air speed over time while in a double jump. That would make Yttrith's glide better.
I know what you mean about Crystie, but I cannot think of any enemy in Keen that was just fodder, they all had something unique about them that affected gameplay. Perhaps if crystals erupt from its back when it is defeated or something like that.
Edit: went ahead and did it.