A pleasant little game.
Has potential to grow and develop, but here are a few constructive critisisms I have from playing;
- Lack of Sound/Music buttons or sliders. A common but appreciated quality feature.
- Hitbox around the upgrade buttons seems very large causing accidental purchaces when trying to click-and-move instead of using WSAD keys
- The only useful upgrades I found were: +10% value, +Shovel Strength, +Stamina, +Sonar uses, +Sonar size, and +Sonar auto-dig chance. The move/dig speed and other upgrades were completely ignored since they had no appreciable gameplay effect and were just money drains.
- The starting loops were very 'punishing' if you got unlucky with sonar or loot. I had two days where sonar missed everything, and the shovel only had enough stamina to get a single low-value item.
As before; I think this has potential to develop further, whether that's through new levels or expanded mechanics. Keep it up!