In this tower defense game you will need to be within a certain radius to your character to be able to place towers, you will also have to dodge the spikes coming onto the screen.

Different ways to die -

Spikes - spikes will deal damage to you as well as teleport you to a different location on the map.

Skeletons making it to the end of the path - just like any other tower defense stop the enemies from making it to the end.