55 Days is kinda like playing chess, but not really. It's a fun game where you build a town on an expanding island and you have 55 days to make your population as happy as possible.
Even dough it sounds a lot like a Farmville type game, it's not. You don't really construct anything long-term since you only have 55 days and there is no management. You only play by strategically positioning buildings so they benefit each other as much as possible.
In short 55 days is a fun chess-like game that you'll just have to play to truly understand.