Honestly, as the game continues to update and grow, it's losing the appeal it had for me original - but it's losing it by becoming more complex which may be exactly what you want!

At it's core, this game play is the following.

- Make colonists.
-- Have enough colonists work to get food for everyone.
-- Have enough colonists work to get resources to build and make defense weapons with
-- Have enough colonists to act as defense against the monsters


Running out of ammo? You need more colonists gathering resourses.
Are the colonists hungry? You need more colonists gathering food.
Are your colonists dying? You need more colonists defending.

More and more the game is incorporating upgrades and developments, but at it's core Colony Survival is just balancing resources.