Interesting little game. I would like a 'play again' button, as well as a way to see the current health of all items. Interesting imagination you have :)
Protect The Tree
In this game you try to protect the tree in the middle by placing trees around it.
Q to plant a shield
W to plant a bullet collector
E to plant an attacker
Mouse click to kill an enemy.
You need a bullet collector for the attacker tree to be able to attack.