Levelling up / kill points and character upgrades

i think that in minecraft, while being able to gain xp from killing a mob is really cool, I do think that there should be more uses to killing a mob. E.g: every time you kill a passive mob you get 1 kill, every time you kill a passive-aggressive mob you get 2 kills, every time you kill a hostile mob you get 3, every time you kill the Wither you get 20 kills, and once you kill the enderdragon you get 100 kills. In your inventory there will be a tab at the side with an xp bottle symbol on it. If you click on the little tab it changes to a grey screen and has little buttons on it that say things like ‘speed=1’ or ‘damage=3’ And every time you click on one of these, the button adds its original price onto what it already has and takes away the amount of kills that it said on the button before it changed. You can see you kill points on the right hand corner of the screen. To go back to your inventory, you click on the tab underneath the xp bottle tab, the chest tab and it takes you back to your inventory and click the ‘x’ button to get out or simply in the xp screen click the ‘x’ button. With this update, you should probably be a lot slower, weaker, and jump less blocks so there is more use to these upgrades. Hope you enjoyed my idea and think it is good. Bye! :)