Nicely polished take on the pirate ship theme we've seen this jam. I liked your take on naval combat, but it looks like it breaks if you stop moving. I managed top line up behind an enemy ship and they just kept firing at nothing while I destroyed them.
Overall, the pacing is too slow for a game jam. Speeding up the movement and especially the digging time would work wonders for pacing.
Well done and good job!