The ascetic of the game is impeccable. The pixel art is on point, but the game play is a bit lacking. It's a really cool idea, but I feel that it is a bit easy. You have so much battery that if you drill in a single column you could probably make it out in one cycle. I think that it could have had some kind of hazard like having to spend time reenforcing your tunnel to avoid cave ins could help.
EDIT: Never mind the game appears to make exits appear based on the amount of tiles cleared rather than a distance from entrance system.