Copper Spikes

This mod adds spikes crafted out of copper. They slow and deal damage to entities that walk through them.

6 ingots make 6 spikes, which can then be placed on any side of a block.
(Any block, for now - but once I figure out how to restrict that, only opaque blocks.)

In a pinch, you can also climb up them like vines - should you happen to fall into your own spike pit by accident.

 
Most mods force you to use precious iron or other things when crafting spikes or, say, razor wire.
Not this one!

The spikes are meant to be cheap and plentiful - a use for all that copper piling up in chests.
Also, they're meant for base protection rather than farming - so they look a lot less 'blocky' and blend in with grass more easily.

Therefore all the variants, once added, will be made of copper and other things you likely already have lying around.