my idea for the level system is when you press p(default) a menu opens up and gives you a gui like this
they will start at level zero and every few points you put in them you get something having to do with it.
e.g. durability you get it to last a bit longer
c.skill your crafting table grows on your main inventory eventually making a crafting table useless
health more health of course
post anymore ideas you have and any ideas to make this less op