Great little project. The digging system was quite nice. I think the digging speed could have been increased just slightly, as it feels just slightly like the digging is lagging behind the input. The fact that you managed to fully develop a voxel-based digging system for the title is very impressive, though.
Some things I did enjoy:
>> The casual humor
>> The story, albeit short, was quite fun.
>>The puzzle was very intuitive.