The first hundred hours of gameplay was spent mostly trying to determine if I really loved this game or not.
The second hundred hours was spent mostly trying to figure out the most extream form of combat goblins were capable of (my personal favorite was watching them pick up fallen limbs/heads and using them as weapons... although that goblin who brained three of my gnomes after picking up a door was also quite amusing... and somewhat sad).
At 600+ hours I still find those 'whoa' moments. That alone should say something.
This game, like many others have said, is a dwarf fortress clone. But unlike that game you don't need to feel like you are looking at the matrix to be able to play it. The developer has taken the time to create simple yet fairly good graphics (considering the fact he's basically doing this by himself) that quickly gives you an idea of the state of the world as it exsists. No two games are really alike due to random happenstance, layout of the world, invasions by annoying goblins and mants, etc. Difficulty can be changed at the start, so toying with the options will quickly create either amazingly simple worlds you can craft to your hearts content... to war torn worlds where your gnomes will likely be missing body parts in a matter of days.
There are some physics in this game, mostly dealing with water. There are alot of worries in this game, mostly dealing with food and safety.
Standard pros and cons:
You get to build a gnome city/village/fortress/slave labor camp
Said gnomes are independant but will take ques from you
Combat is entertaining to read, especially when limbs start flying
Swords and guns. Steampunk at it's best
You can build epic wonderlike structures
Your gnomes can starve if you are overzealous with expansion
You have to actually care about placement of structures
You can make pet rocks
Diplomacy was added recently to add some options to irritate your neighbors
Is somewhat modable, mostly just graphically at the time being
Not as advanced as dwarf fortress
No sickness/diseases to combat
No magic system
No annoying elves to get to chop up
No animations (once again, one man show here so give him a break)
No moral system as of yet
Basically if you like the idea of Dwarf Fortress but can't stand looking at ascii all day, gnomoria is definitely the way to go. It's easy on the eyes, easy to figure out (if nothing else go on the web page and look up a basic tutorial, lots of them exsist and all you really need to know is the standard build order to get you going, the rest is there just for you to learn on your own and die alot. Alot.)
This is the kind of game I wish exsisted back in the 80s-90s when I was in school. Me and my friends used to imagine building forts/castles with various creatures and defending them from hordes of annoying goblins and the like. In this case, it's not on paper, it's a living breathing world where you hope that your gnomes armor isn't going to break when that ogre swings at him, seeing as he's your best builder.