As the title says, if you could pick just one thing to add to the game what would it be and why?
Try to keep your answers short and to the point. Bonus points if you concept up the item (MS Paint skills are fine)!
Please note that this is just for fun, I can't promise that anything anyone suggests will make it in to the game (even the item I'm about to suggest).
I'll start you off with an easy one, I would like to see "a bucket" added to the game. Whether it is to carry water to your build or to manipulate water in place.
Here is a concept that you may have already seen, full disclosure I didn't draw it, I did a @Steggs101 and borrowed it from another Developer (thank you @Minyi).