Thanks for your comment! :) Yes it's true, the idea of water vision came to me at the very end and I didn't have time to create interesting gameplay with it..
But the idea would perhaps be to only be able to activate it at certain times, or to have a timer, or for it to disrupt something else (like the character's speed) or to make you more vulnerable ?
I'm also thinking that other things could appear in water vision, like ghosts or epic cyanobacteria ahaha :D