I am learning to use linked lists in my games, and thus have started working on Virtual world to prevent me from getting bored.

It is basically a free form rpg, no objectives, just survive.

Al I have done is the human class, and started on making the other main creature in the game, the mutant rabbit.

Anyway, I would like suggestions on easy to add features that you would like to see in this game.

What should the player be able to do?

Should he be able to play as something besides humans?

Should I implement network support, so , for example, you can connect your worlds to a server.

And should I make the world a dynamically expanding thing in which you make a house, chop down trees, sell things, kill people you see, shoot allies, live in medieval if you choose so...

Etc...

I would like your feedback.

Yes, these are must:

Be able to live a normal life, build stuff, buildings...Sell, kill...