We completely agree with you on the weapon swapping needing to be improved. Mostly the state of it is because of legacy issues from the projects early beginnings. Moving forward it will be rebuilt.
Enemies will miss you depending on you speed, but this mechanic can be made clearer.
The moon jumping is by design, but will be tinkered with after feedback.
Thanks for the feedback. Stay tuned, Diluvian Ultra has just started its evolution : P