It would be great that your blockhead coul grow and changes what it looks like over time by doing things, It would be like Mr.Pickle's Baby Mod, But YOU ARE THE BABY!
And over time, You get more tools in your inventory as you evolve, Like you start off with a hammer to break passages and hunt for food, Then soon enough you get a spear, and soon enough when you reach the end of evolution you can make vehicles :D
Is this a good idea?