Asterminer is a zero-violence, slow, and relaxing game; Hover around exploring the mines, looking for crystals to gather.
Load the train to complete the level and open up new ones. Solve musical puzzles to open gates or deploy bridges. Find hidden beacons to increase your storing capacity, and find about the story of the United Earth Mining Company to learn why gathering crystals for them is so important.
*Despite what the Play Store says, Asterminer doesn't not use "Google Play Games", nor is a "Family library" game. I have no idea why it's showing those characteristics. I just haven't been able to get those to not show :(