Good:

• Cute characters
• Charming
• Environments look cool
• Another example of how you don't need not-flat textures so make an area have charm
• Good idea
• Fun puzzles

Bad:

• Little fish controls like garbage (Either fine tune or simplify, good idea for controls though)
• I'm sure you remembered this at 2 in the morning the night after, but it's called a trident (related: you don't need to explain you ran out of time, her forgetting what it was called was endearing)
• Short demo, but game jam game so
• If her portrait eyes are always closed since she can't see but her model eyes are open? (Game jam game though)

Overall:

8/10! If you finish it I would love to play it! It's super cute!