Plugin is never a good idea. This seems more like a beta.

good but you could add these stuff to make it better:
-some shader (if you can).
-add hostile mob,neutral mob,friendly mob.
-add health bar and inventory
-the tree need to be solid
-add weapons
-add items
-add foods
-add a menu,option and other
-add water,lake,sea
-add the sun
-better sand

you must add a purpose to the game

why a plugin!