Flame towers are great at fending off large numbers of small enemy units. They deal damage over time, but their effects don't stack so it's best to place them away from each other. Their flames can set trees or other flammable objects on fire.
X-Morph: Defense launches next week, on August 30th. We can't wait to see you playing in just a few days :)
https://youtu.be/NOK31n9NN0s