Lovely visuals, and fishing is fun.
If you allow me to give a little feedback, the use of the limitation is super creative, however I think the game could be a little more challenging, because it's incredibly difficult to lose, seeing as it's actually possible to get fish without blood, and blood takes way too much time to dissipate on the water. I spammed the blood button just to see what happens when you run out of blood. My opinion is that with a few tweaks here and there to the core gameplay, this could become a very engaging game.
The music does gets in the way after some time, because it's a bit loud. Not a big issue for me, though.
Overall it's a nice and chill game, good job!