Why not have a small, mild-speed robot that beeps and explodes 1.5 seconds after it is within... 3 blocks of the player?
No need for an exact copy from minecraft.
I don't mean to be rude, but this is what you're doing with Lego Island, right?
Guns are in other videogames. Guess we should delete those. So are vehicles. Gone. Building is also is several videogames, as is walking and flying.
Other people think and breath.Man, better stop doing those.