Okay, this is pretty good honestly. It' 2d Raft, a lot of people like raft. I do have some criticism though.
1. Those floating stones just seem like bs rng. With the sharks you have a way to defend, but I couldn't find any way to beat the floating stones. Having things that can damage your raft is good, it adds a good element of tension, but when you are completely screwed cuz one is about to shave off half of your raft and there is nothing you can do, it's frustrating but not in a good way.
When making a difficult element, it's always good to make sure the player can win, when they lose its human error. Granted I might just be an idiot and couldn't figure out how to defeat the floating stones, something to consider.
If I were to give a suggestion maybe add a paddle so you would have to steer the ship left or right to avoid them?
2. The UI is a bit of a pain. It could be easily solved by having keys 1-5 control the action bar slots in the top right hand corner, clicking on them each time I wanted to do something was quite annoying.
3. I feel like the fishing minigame is too easy. It seems to be inspired by Stardew Valley's fishing, which was really good. But in Stardew when you cast in the water you have to wait a random amount of seconds the left click in time to even get to the minigame.
It may feel exactly like Stardew Valley's but there is nothing wrong with that since it's a good system. When you are further along in development you can add your own twist to make it somewhat different.
I really do think you have something good here though considering how early along the development is. Keep chugging along! I'd play this!