There's only one melee weapon, digging tool, building tool for each now, but I think you should add more.

-Melee weapons
Machete:Fire rate is slower than the knife, but the range is longer.
Hammer:Not only as a weapon, but also can be used for digging. You can strike back without swapping weapons.


-Digging tool
Drill:You can dig faster, but it makes some noise.
Auto digger:When you put this, it automatically dig there. Digging lasts untill it hits undiggable block.


-Building tool
Barricade block: It takes longer to put, but you can put several blocks at the same time. Also tougher than the normal block.
Glass block:The block that is transparent.