i have not passed a year but i got all the endings:
Drafting a new constitution
Stopping the Last Judgement Gang
Curing the zombies(which didn't really work)
small tutorial:
the bottom two brown circles are your power, start your piping from there
when you fight you will see a lever at your bottom right, that will control your control valve(if you installed it) the red circle in the center indicates the pipe being used (eg. half the circle is red on the right the right pipe is open and lets steam through)