Pretty cool game here! I really like the visuals of the dirt falling as the drill plows down. The upgrade system is nice and works well. Unfortunately I think I encountered a bug or something because no more ore or anything showed up past like ~3200m down. I was a little confused at first on whether or not I should be trying to get the ore because of how it slowed me down to a grinding halt, and it seemed like you get a better score for just going down deeper. I liked the weapon variety and the effects, however they could be a little more optimized or at least not all go off at the same time. All in all though I had fun! I just wish I could have experienced more to do past 3000m.
You can watch my gameplay video playtest here for some more feedback (and see the depth bug I ran into):