Could you maybe make it so you can drop the tool in your hand with E, and make it so that weapons aren't pre-programmed to a certain spot? Also, you could implement the swords by making some sort of cursed mine that when entered releases zombies or some sort of creature you can kill, which drop gold. You could turn into a sort of dungeon, with a cooldown time on the creature spawning similar to the ore regeneration. You could have multiple floors that each require you to be a certain level increasing with each floor. You could have tougher and tougher enemies as the floors go down. This would be very helpful if you ran out of money and had no grips, which means that you cannot do anything because to earn money you have to make weapons and to make weapons you need grips.