Hi fellow GGJ bubbler! :) We also weren't satisfied with the feedback fro GGJ and came here :))
I really liked the art in your game! It's quite beautiful!
What was missing for me was the upgrades - the game feels like Vamprite Survovirs and other similar bullet-hell games. I noticed that I am waiting for my next upgrade, and I'm not getting one, and it felt a bit weird. Also, it was a bit confusing that fish don't die until you stop shooting at them - it didn't occur to me that I one-shor kill, so I kept shooting, surprised that even the first enemy was not dying after like 20 shots :D
Also nice intro to the game :)