Copper buttons and how they'd differ from stone and wood buttons.

I think copper buttons should work differently from stone and wood.

Wood lasts longer and can be activated with arrows, while stone is shorter and can't be activated by arrows.

Copper buttons, as well as gold and iron button to add more variety, can be held down by the player and will function like a pulse extender.

The longer you hold down a metal button, the longer it will stay pressed down. If you hold it for 10 seconds, it'll send a signal for 10 seconds, if you hold it for a minute, the signal will last 1 minute.