Castle Defense Beta!

Hey everybody! Its me again! But I am doing a whole other project.
This is like your standard tower defence,
-it needs 2 or more people,
-you attack the castle,
-you overtake the castle
-you kill everyone inside the castle,
-you take the diamonds,
-you win.

However, this one has 5 different start off places for an attacker. They could start underwater, in a tree, on a pontoon, in a Forrest, or on top of a mountain, there is also a hidden sniper point! The defender sadly, has two options. Defend from the ramparts(Walls) or defend from the tower above. But it wont be easy for either of them. The attacker could just simply sneak in an underwater tunnel and use an invisibility potion. Or hide in the Forest and snipe the unsuspecting defender.

Many thanks to 8bitcrafter for helping with the idea.