This was a pure rush of dopamine-- I think I actually lost track of time while playing it, haha!
It's everything you want in an arcadey hand-held type of game: easy to pick up, hard to put down. I absolutely loved the progression and how enjoyable it was to try and find new things across each dig, or beat my previous depth record.
The controls are simple-- they feel a bit clunky at times, but it doesn't subtract from the gameplay. I can definitely see a younger me playing this on my Game Boy during a long car trip.
Please consider working more on it; I'd love to see more caves/areas, maybe an endless mode? Stellar job!