Gameplay

1. Your villagers will apparently have common genes inside one village and not only parents genes effect what villages children will look like. This makes hard to keep annoying features off from spreading to whole village. So when you start make sure all your villagers have noses that you can stand to watch 14 times in every generation now and forever - if needed. Don't pay too much attention to your villagers hair colors: original twins are almost always born with black and light hair color, so you can't choose your color scale anyway.

If you aren't happy with your starting couples looks, you can always go to your facebook settings, remove Village Life and start over. This may feel pity, but on the other hand you recover bad mood caused by this in hour or half, but if you take villagers with pinokkio nose, may be you watch it for month on every your villager and it stops feeling funny and personal anymore. It can also effect your chances to match your villagers with other players villagers. After you have been building your village with care, small details can start bothering.

2. When game starts, avoid clicking even near any work your villagers are doing, and buy keys with gems every time you have enough gems. This protects you wasting your gems to completeing works, and getting stucked later. Loosing 25 gems to something else than keys is already critical for whole future progress, so keep it in mind!

To avoid accidents 

* Never target villager directly from screen, instead use menu in right bot corner of your screen to target villagers.

* Decorate later, let your villagers finish all works nearby before you start renovating nearby

* When you harvest something that grows in a tree, click the tree, not the basket once the work is done

* If you clicked villagers work by accident, don't release mouse key. Instead move it to corner of screen and scroll view until you don't see whole villager anymore, before releasing it. Gems are not spend if you release mouse key far enough from where you pressed it down.

3. Build houses early as possible: At beginning your situation is quite ideal compared to what it possibly will be for long time again: you got 3 working adults, very little needs that are easy to fill, plenty of extra keys and lot of time for other things than keeping up level speed.
Use these resources to unlock one or two next houses and resources needed for them, as long you can do that, and start building them immediately, with one adult per time so rest of them are free for keeping up leveling.
This alllows you focus better to developing other things in your village in future, and you won't be suddently completely stucked for 3 days while waiting some building to finish, just to make villagers stop complaining and have some fun finally.

4. Unlock 2-person houses instead of multiple person houses: they cost less keys and fill your villagers needs just as good - even better because first 2-person house to unlock is already better than first multiple person one. They also take less time, maybe in return you get less beds at once, but on the other hand your villagers won't be "bound to" building same house for too long per time.
This is important because when you got only 3 adult villagers, may be hard to run villages other functions same time if one is bound to building it. If additionally another one is pregnant and you got only 1 working villager to fill mothers and two childrens needs beside their own ones, there is nothing you can do.

5. Let your villagers drink some water, eat foods that they fancy (and that are already in storage) between building and crafting projects. Filling their wishes is way to keep up gaining happiness and takes only some minutes to wait for that. Those minutes they also regain energy, so it's not wasted time.

6. Spend a moment at start to check which skills your villagers got, to have some idea of tactic.

* Lumberjacks have got most time and energy taking works at start, miners soon after, so avoid using your best lumberjack to other tasks if his energy isn't full and nothing else available for him to spend it for.

* At beginning you won't either have farm, so spend first your farmer villagers energy to end or put them build time taking things like houses.

Later farmers will have plenty of hours taking works (15-30min with good farmer) but those works take nearly no energy at all, and need to be done only once or twice per game time, so you can still keep using farmers a lot.

What to do when villagers are too unhappy to have fun?

When your villagers are unabled to have fun they got red mark over green smiley at corner of their picture. Try to fill needs that you are able to, and give them some time. Usually at least one of them gets mooded up enough to have fun and keep you leveling: leave that villager alone and use cranky ones to slave work instead.

Try to unlock fun buildings and entertainment stuff before you unlock foods, because villagers want foods randomly in short periods: at morning when you lock in it can be apples and strawberrys that you don't need to unlock, at afternoon potatoes and gabbage that you didn't get unlocked yet. Missing fun devices instead don't disappear from their thoughts for a minute.

Finish flower bed, duck quest (level 15), inspect fallen tree quest (level 18) and deer quest (level 20) as early as possible, to not get late in keys.

Babies - as stated in article of villagers lifecycle - are easier to keep having fun for your level up. They give around 10 points per time, which keeps repeating, so it's pretty good bonus to your happiness production already.