The sequel for the previous Ovum Defender. Tour mission is still same: prevent the sperm reach the egg. But now you aren't work alone, now you can build guns and/or ships to assists you.
1. Simply kill all incoming sperm
2. Control the main gun with your mouse, shoot by pressing left mouse button
3. Press space to switch between auto-pilot/build mode to manual mode
4. Use WASD keys to pan/move the camera
5. For more detailed instruction, please read the HELP/HOW-TO section in the game