Its was a good time digging through a world full of quirky characters full of personality and pretty fun dialogue. The visuals are so sweet, too, with great sprite work and designs of the characters and treasures to add to the charm, and feel right at home on Game Boy (especially when the palette changes upon digging deeper).
The digging is simple but lets you dig anywhere you want, but also be careful. The game is slow to start, but it then gets satisfying to upgrade your digging and stat abilities and the game really gets fun when you get the Drill Booster. Maybe backtracking could have been reduced and it was a bit tedious to dig everywhere to find the remaining treasures, so a treasure detector would've been welcome.
Overall, though, you guys did a fantastic job!