I got an idea about a rock DLC because i assume there will be a DLC with more rock types in them?
Anyways. I thought to myself, it would be cool to have an exploding rock!
I should be able to damage the entrance to -50% BUT theres a catch. Unlike other rock types like the spikes, fireball and angelrock-thingie that just crumbles to pieces and fall of the rock it should blow the rock to smitherines when destroyed and maybe be a little less resistant to damage.

Now to my question.
If there will be DLC, which i assume. Will it be free or something we need to buy?

Can't confirm anything for sure, but our initial take on DLC is that it should be free. But it doesn't completely depend on us.