You have to make a stew,that the villagers will eat.  Your villager feels no need to breathe.  The stew for this is: Black+Orange+Orange. The plants to use are the black flowers near
the waterfall(Where you bury your dead),the orange-red flower is at
the south edge of the village.  You also need the cauldorn you get from the wood pile,that you use to build the huts. After you make the stew
the villager will say feels no need to breathe. Take them to the pond
where you get the water to water your crops(they need to be a Master Farmer,and you need level 3 of the Farming Tech. ) They will
find a alage-eating fish,you will need more then one. Place them in
the Ocean,the alage will be under control and you can fish again. This will make it where you will always have enough to eat.  Also when
you are not playing the game,pause it by hitting the spacebar on your keyboard you will be able to keep your villagers alive. I hope this helps you.  Good luck.

You can download a trail verison of the game(it gives you 60 min. to
see if you like it. ) If you do you can buy the full verison.  All you have
to do is follow the way it tells you do it.  Then you can play the game,follow the instruction on how to play.