Bought it on release. Lost tremendous amounts of sleep.
I approve.
Now, for the longer recommendation: The visuals are pleasant so you won't get annoyed with them while playing for extended periods of time. The extremely varied amounts of building options are available to you fairly early within the game. No need for upgraded equipment to get your gold, gems, obsidian or whatever. Building is fast and fun, upgrading your equipment sometimes takes time but is rewarding. Worlds are HUGE (like your ex's behind). Computers that are being thrown into the dump could play this. Playing and adventuring with friends is a riot.
I have clocked in over 25 hours and have barely scratched deeper than the surface of what this game has to offer. I took a quick peek at the wiki and there's a great number of environments I have yet to discover, a couple I have discovered but am getting my ass kicked in when I enter them, a great deal of items I have yet to find/craft, and tons of ideas for structures floating around in my head that I have yet to realise.
The game's challenging if you want it to be but extremely laid back when you don't. Even night time is peaceful eventually.
Look at me rambling. I'll stop now. All you need to know is that it's great fun.
Oh, and if anyone wants to help me beat Skeletron, hit me up in about a week
