dense ice
Add the ability to prepare an attack and hit whenever you want.
This would make sledgehammer kills more convenient and just add more fun.
Right now you can only hit certain walls and objects as well as players, but with the change you will be able to prepare your attack and become more efficient
You can also add the effect of concussion when getting hit. You can increase the power of the sledgehammer and pickaxe to kill with one hit or leave two hits, but with the addition of concussion and slowdown when receiving a hit.