The Lite version is very challenging in a number of ways, but particularly in the area of gender imbalance caused by the limited population. The Lite version is intended as a demo, although it's possible to complete the game if everything goes well. I've done it many times, but I've also lost tribes due to the inability to continue producing offspring.

The most helpful possibility is a fairly good chance of one of the tribe-saving Island Events happening in your game, especially if you change the game speed setting to the slowest speed once you have a population lower than 8 (not paused, which will cause events to be skipped). There is no facility in the game for "deleting" a villager.