very nice concept, the game is a bit too difficult though. have always loved these kind of "drifty" controls in games, and the graphics are pretty nice as well. overall, a solid 4/5.
The easiest way to get the hard badge, is to get as deep as is enough to move around comfortably using nitros, and from then on use the remaining fuel to move sideways in one direction and sweep the area using the mole. +vote up if you found this useful, please.
 "MoneySeize"){kind=icon}
 "Particles"){kind=icon}
 "Space Drift"){kind=icon}
 "MegaDrill"){kind=icon}
 "Cloudstone"){kind=icon}
 "ESCAPE"){kind=icon}
 "Enigmata: Stellar War"){kind=icon}
 "Solipskier"){kind=icon}
Thank you fro your Feedback! Also I've updated the game and rebalance acceleration, speed. Now it feels faster and more controllable.