Thank you for your detailed feedback. While this game never was intended for a larger audience your replies make me feel like it was.
I took a week off from work to join the jam and since I hadn't finished a game in three years this was my main goal. But I also wanted to try new things so my list had particle effects (the bubbles), a shader (water distortion effect and oxygen bottle), music and more animation. So thanks for noticing the little things like the bin that opens.
The stucked sea creatures is a bug that though I had removed completely but from your description this is still an issue on the edges. Unfortunately I had 2 days before the end a glorious bug that would confuse the sea creatures so much that the game became unplayable. Fixing this bug required me to do a rewrite of some architectural parts of the sea creatures state machine. This took so much time off that I couldn't fix some other things or implement a proper game over screen, a pause menu or the five other creatures I originally designed but could not animate in time. I planned for cuteness overload having a sea cucumber picking up trash.
Thank you again for taking the time that was very nice.
P.S. : Right, yes, I'm from Germany. Keyboard layouts are weird and since I used to be a professional software localizer, I should have known that AERTY was a thing. I'll consider this for my next game jam.