Very cool concept! I like the visual of growing larger and larger. I was a bit confused in the beginning why my tentacles couldn't reach very far, but it didn't take me long to figure that out 😅.
My main piece of feedback is that once I was a high enough level to eat the things near the top, I found it a bit frustrating having to dodge all the small fish to get to my target. I often ended up accidentally picking up the smaller fish that were closer to me rather than getting a shark or boat.
I saw it mentioned by someone else, I also think that holding the mouse down for the whole game is a bit tiring. Maybe having the tentacles track the mouse position and then you click and hold to catch something and drag it down would solve both of these points.
But really well done, especially for a 48 hour submission! 🙌