This is a pretty cool game. A little sparse right now, but you got something here.
Bug: Reverse does not have a the same force applied to it as accelerate. So if I have a full load, I can reverse at a very fast pace rather than accelerate slowly.
Would be cool if the mine sprites changed as the resources dwindled.
The battery isn't enough challenge to make the game engaging. I think there needs to be more stuff to make it challenging. Enemies, weather conditions, etc.
Once I have upgraded everything, there is no reason to play. Probably should have some end credits to mark the completion of the game.
I would even say the play field should be larger to include better mines further away so that players have a goal of upgrading ship to get to further mines that are worth more.
Keep up the good work, the game feels pretty good!