I find that if I can hold it togeather for the first year and a half things will be ok. Things usually start to get a bit more savage later on when you have 6 wounded dwarves and a few more who are a bit unhappy about something, Bridge gets smashed by tantrumer, wounded go bezerk, gobs turn up, more deaths = more unhappy dwarves = tantrums. Next thing you know the sherrif and hammerer are handing out beatdowns and jail time like its going out of fashion. Watching the social breakdown is probably the most and least fun thing about this game.
You have done VERY well to hold it togeather like that, I lost about 8 fortesses just learning the basics.
The only comment I will make is that after the first 3 years you probably still havnt seen a goblin seige, been attacked by 50 ratmen, dealt with the bastard nobles and trapped yourself a few Gorillas.
These things are all great fun the only reason not to play on is the economy which is a damn pain (build 100 stacks of coins and lock them up seems to work).
Once you have farming worked out basic survival is easy after the first winter. For me it is the big crazy projects that you start to need later that really make the game. (Im tired of dealing with goblins, what I really need is 50 elephants at the front gate, How many elves do I have to teach to swim before they get the message? You know what I need? giant tombs, lots of them! Make 150 steel axes and assign everyone to woodcutting? Great Idea.)