There's not much of a tutorial that I found unless you travel to wiki pages or youtube videos of other's experience in the game. But without those you are greeted by an npc that tells you tid bits on what to do.
I started with digging some holes to gather materials while fighting slimes. After gathering enough stone (could use dirt I suppose, but I wanted a better looking house) to build the outer line of my house while gathering wood to make a workbench and further create the materials like walls or doors that I needed to finish the house.
With enough materials and creativity you can make very extravagant house or castle. Once you have the wall set up inside with chairs, table and lighting you will eventually attract npcs to stay in your rooms.
Once night fell that's when you either stay in your house to watch as the zombies try to beat down your door or you venture out to face them.
There is many things to do in this game, and the world is vast for just yourself. You'll dig down below the earth to discover treasures like heart containers to increase your health or treasure chests with some nice little item in it. And that's to get you somewhat prepared for what else lies in the world. I think building my housing area is where most of my time has been sunk.
The deeper you go the stronger the enemies can get as you fight in underground jungles or the "hell" level that awaits below with dangerous lava's and teleporting imps.
Crafting keeps you busy as you have to gather materials from bosses or meteorites that fall from the sky; and there is a wide variety of items to make to improve your combat abilities at what else awaits you. From crafting armor to light saber style weapons.
Even though this game is considered a Beta still it will keep you busy till further material is added.
What makes it great too is the fact you can start up your own world to have friends join your or join their own game. Trade what you find with them and help them take on the bosses that were giving them trouble.
Downsides - you may find it childish graphics and compare it with minecraft (which I haven't played so can't comment on) and yes the graphics are low but that's not something you'll linger on for long as you get enthralled with what's below that next piece of stone.
Reminded me of Zelda in someways with item names and monsters.
Give it a try you won't be disappointed for it's low price of $10.
