Detailed Instructions
Use the MOUSE to aim and fire (some turrets auto fire when you hold down the Left mouse button).
Press

-

to cycle through different turrets.
For a more detailed explanation of how to play, please refer to the in-game tutorial.
Tips:
- Read every turret's description carefully -- planning ahead can save you a lot of hassle.
- Don't forget about buffers.
- Positioning is important! Enemies will gun for your top and rightmost turrets first, so consider sticking buffers and weapons with long reload times toward the bottom left of your screen.
- You can repair or store destroyed guns without losing any of their upgrades or experience.