I see in that you responded to one of the reviews that you will update later today making the ability to make any blocks breakable. Did you implement that feature and if so how do you use it? The config does not say anything about it and neither does this page from what I can tell.
Adds durability, but once the durability has been damaged, replacing with another block maintains the same durability. This also happens when the block is destroyed, meaning the new obsidian is only a one shot, even though it should be 5 durability