Really creative way of implementing a "fishing" game mechanic, I really like it! Like tex mentions, additional abilities from crafted takos instead of just being trophies would be really cool.
Also, since this game is about Ina, maybe in the future you can develop the lake to go deeper (perhaps with progression from upgrades or crafted takos), and you'll start to encounter horrors or eldritch being and stuffs to fish up? I think it would add that Dave the Diver's/Subnautica's addictive element of exploring the deep to this game.