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Hi, Rudi,
Thanks for taking the time to play and post. You've given me some very useful feedback I think you're totally right about the mouse cursor in the map screen. Even though any click takes you to the next level it feels weird if you've got a cursor, then suddenly have no cursor.
Yes! You can destroy the spawns. Remember that every time you hit with a bullet it charges up your gun. So if you take a second to destroy the spawns your gun will power up faster and the flying enemies and everything else will become a lot easier.
The flying martians are very sensitive to seismic vibrations. Any walking will disturb them, so if you need a break to recharge your shields you can stop walking and they will stop coming after a few seconds. This trick doesn't work in the boss area though because the drilling machine is constantly shaking the ground.
Thanks again
Also, the name "Children of Apollo" is because the colonists on Mars that you are sent to rescue are the generation of space explorers after the Apollo Moon missions.