Defense Against The Giants

Defend the mysterious jewel against the giants invading your small world.
A tower defense game with 10 waves, can you beat them all?

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This is my entry for ludum dare 38 - theme Small World. Made in 48 hours.
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Controls
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Control the camera with WASD or the arrow keys
Place selected building with left mouse button
Cancel the placement with right mouse button.

The Towers
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Arrow tower - shoots fast but weak arrows at enemies
Cannon tower - shoots slow but strong cannonballs with splashdamage
Gold mine - Generates gold every now and then
Runestone - with magical abilities it slows down nearby enemies.