Excellent music, art, and vibes. The levels are bit too long/high scoring. It really makes having to retry punishing. The treasure speeds feel just right, though maybe letting them move down a little faster than they move up might let you save some otherwise unfishable treasures? So many great little touches though (thank you for allowing the player to pick up a treasure in the same space as a piece of trash! that buffer is so necessary!). One little touch I would suggest? Make the fisherman really struggle with the heavier treasures. If I have to suffer through slow movement, so should he!
For real though, this is a great entry, and really captures the Gameboy spirit!