I tried this one before actually, but it wasn’t really my thing. It is OK. I like Warcraft/Starcraft, but not usually tower defense style games. Fat Princess was more my speed. I play it with vatolobo sometimes though. He is or was pretty big into it :)
If you think about all the things we touch in life, and where all the air we breathe, water we drink, and food we eat comes from, this is probably a giant cobweb enshrouding the earth. The atoms that make up our bodies could have come from gasses that once floated in the upper stratosphere, water molecules in the deepest trenches of the ocean, or even iron that welled up from the center of the earth through a volcano.
6700000000000000000000000000 atoms. Just think about it :) Where it all came from, where it is all going to go.
And that is just the matter.