Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Tower Defense Basic Pixel Art Pack Free.
Tower Defense Basic Pixel Art Pack v2.0
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This pack contains the basic objects to start building your own Tower Defense game.
This pack includes 3 different towers:
Knight Tower:
-It can create 3 knights.
-It can update the knights damage.
-It can add a shield to the knights.
-It has a flag to place the knights.
Archer Tower:
-It can update the arrow damage.
-It can update the shooting ratio.
-It can update the accuracy.
-It can add fire to the arrows.
Magician Tower:
-Basic attack with fire.
-It can add an “extra” fire ball to the attack.
-It can create a trap anywhere into the map to decrease the enemies speed.
Knight Animations included:
-Walking, attack and dying.
Enemies Animations included:
-Walking, attack and dying.
(Dying is not used but it is included).
To see the gameplay: Click here
====[UPDATE v2.0]====
-Android phone friendly UI.
-2 new levels.
-Waves editor.
-Sorcerer enemy.
-Air enemy.
-Fire controlled by “Object Pooling”.
*To see the android phone gameplay demo please visit: Click here
====[UPDATE v3.0]====
*Finally… example sounds effects are included!!!
-Now you can change the sounds effects easily.
-About music it includes the Unity Free package https://www.assetstore.unity3d.com/en/#!/content/19233 as example.
-Canvas UI is corrected scaled.
-I have added a lot of comments to the code.