Maybe I missed it but it wasn't clear to me what the fail state was because the game seemed a little easy? Maybe it's just cause i'm not used to these kind-of-cozy-games.
What i can tell however is that i would have liked some more art as some things, especially the UI (which in a game like this have extra importance because you absolutely need to look at it to win) should have had more than default unity sprites. The fishes and catch movements also felt a little jittery. Further adding to the "unfinished" feel is that the fishing rods sprite just cut on the side? It feels like it should have been placed on the border of the screen but it wasn't.
I do like the shop items though, even if i would have liked to see price shields and/or a description of what they do.