Skript is alright. But ill make a list below of things i think you should do.

* Don't include "created by crystalican" in every message. + There's a lowercase letter at the start of that message.
* Make the "Advanced Health Manager" say "AMH" or something so it dont take up entire chat.
¨* Alternative to the above: Make it say above hotbar instead.
* Add aliases. "/hm gui/menu" "/hm regen" etc.
* Add tab complete.
* Add a help command for it so you know what commands exist.
* Add a error message if you do the commands wrong