Some types of towers end up just taking space and are not incredibly effective. Right when you begin on the first level you have three options when it comes to towers. These are arrows, bombs, and water. Though the arrows are the cheapest and water “slows” the creatures down, bomb is really the only option to go with. It has the least resistance from creatures, while arrow has quite a bit including the Devil. Storm and ice are also resisted quite often, but not near as much as arrow or water.