Hey Zitta,
I really loved the design of the fish! It's so nice and simple - and it's really cool how they become arrows. Additionally, the level design was really nice! I felt like it did a really good job at starting simpler so the player can learn the mechanics before increasing in difficulty. This is a rather small critique but initially, I read the grey area you can move around in as a text box you'd close out of once you finished the tutorial, and I kept trying to figure out how to click on the exit button, it took me awhile to see the exit and then realize the exit text was a label and I was already in the level. I do wish there was a bit more of a distinction between the borders and background. Also, I felt like the fish moved extremely slow - while it did a good job of communicating this feeling of being underwater it also made moving around feel tedious at times. Overall though this is such an interesting mechanic! It was alot of fun to play.