(Below pasted from the Game Maker Community topic)
- Basic Tower: Starts with a mid-level attack range with an AOE shot and upgrades to higher range, shooting speed, damage, and AOE.
- Ice Tower: Stops enemies that it shoots who come within its very small range. Upgrades to longer lengths of freeze.
- Poison Tower: A tower that shoots poison darts that will poison enemies into being hurt for a period of time. Upgrades to longer poison time and a higher shooting speed.
- Flame Tower: Blasts flames in a radius that will damage any enemy nearby. Good early on, but can be near useless later on. Upgrades to shorter times between explosions and more damage.
- Epic Tower: An expensive tower that shoots quickly and with very damaging bullets. Does not upgrade.
- *NEW* Darkness Tower: This tower spits out small enemy-seeking missiles that will continue to hunt down enemies for a period of time that can be increased through upgrades.