Ridiculous
The tutorial is very long and difficult to learn something.The build system is confusing and horrible.The upgrades were also a bit confusing.Because the only way to kill enemy tanks is clicking on them,and on their bullets,the game is just a click feast.The inactive building system is also horrible.You are swimming in a sea of bullets and clicks,and you need to click in the number of the bulding that is inactive!Bleargh!
Now,for the tips for improvement.The building system,a simple "drag and bulid" one would be enough.When building,you should put the price of the building in just one time.It confuses a lot,needing to pay attention to your mana.The upgrade system could be more open,,and the main tree should have an auto-firing,upgradeble turrets,and the tanks,they could respawn in the enemy base,and walk toward your tree.