Really nicely done! Nice simple mechanics, easy to grasp; very nice graphics and audio, and a well adjusted difficulty level.
Here’s my best:
One tiny bug I noticed: sometimes when two treasures are right next to each other and I start digging while overlapping both of them, they both disappear after 5 digs but seemingly only one of them drops a coin. Should be an easy fix.
Great job, mateys, HARRR!