a lot of fun. breaks around 1.5 trillion feet on every hole. The ore and crafting is cool in early game, but doesn't do much after the numbers get big. Once you hit 1 million research points, it all moves so quick that you're through the ore before you have time to collect anything.
I hit around 99 million research points and there just wasnt anything left to discover or do, and new holes take like 5 minutes. That said, it was a blast all the way through