Cool game! It got a bit tedious after a while with no way to move faster. I loved the radar mechanic with the rovers, very cool! I found myself staring down at the radar most of the time. I bet you could make it ping less frequently or give the player a limited use of radar scans. Maybe you could collect radar charges around the map as well.
Great job nailing the cold and unforgiving tone though. I felt really tense having to make the decision to move between certain mines while I was checking the radar.