Press green flag and let it play in another browser tab! :-). You can adjust the fish's speed and watch him swim around. More features to come! (the game wont become too clunky as its just meant to be played idly.) PS: Its pronounced Feesh ^_^
Fish script from - https://scratch.mit.edu/projects/136/ I did the frutiger-aero esque art myself!! Let me know if you want a tutorial.