So I'm finishing up for today, so far achieved:

• a robust world building tool
• a not so robust destroying system (need to implement A* to check if there is a connection to root node, might not do it at all)
• creating different blocks
• toggle UI
• defined idea for the game

Idea

The idea is simple you have a small world where you will build certain resources, eg.: - water + earth = wood on earth, fish on water. - water + water = big fish - water + earth + fire = metal on earth block - and so on.

The challenge (not sure if will get to this stage)

A world destroying Empire requires payment for taxes, if you can't provide in certain time, your world will be destroyed. You will have limited time to produce the resources and will have to think on your feet how to structure your world to create the required resources in time.

And here's a little gif: Imgur