It's a good idea, i hope you plan on improving the game. I have an idea, the number of mineable planets/moons should influence the unlock cost of a system.
This Game ... is ... WONDERFUL. The Story is magnificent, the characters are alive, the conversations are fun. Every time after i spend a few hours playing flash games i feel bad that i "throwed" time out the window but this time, every second of it worth it. I wish you can make a sequel. Respect!
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 "Planet Miner - The Search for the Elements of Life"){kind=icon}
 "RPG Shooter: Starwish"){kind=icon}
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Thanks for your comment.. I'll add your suggestion to my todo list.