Cute signals for treasure to dig and overall smart stage design, I think I ran into a softlock on one side though sadly. While I enjoyed digging around and finding the diagonal sea patter becaume quite tiring/trippy to my eyes, even more as if you diagonally down it seems to be vibrating, which is either cobblestoning or just a visual “artifact” of the pattern, but it did disallow me to play for a long time.
Graphics wise other that the sea patter I like what you had, the color palette is punchy but not offensive, walks that fine line well.
SFX and music were cute, well done on those!
Overall cool idea and entry!