This was very cute and fun to play once it clicked, oh, keep him in the screen. It was deceptively difficult though. I loved the little moments where I felt like I was playing some weird version of pong against myself, rapidly laying down seaweed to right the fish's course.
Love the little touches like having the blowfish bounce off the mouse UI and that you didn't have the song start over with each death. Fun, short play. Thanks for sharing.