I really like the idea behind the core loop of this game but it has some flaws preventing it from being enjoyable for me personally.
As others mentioned the pace of the boat is very slow, which is an issue but one I think could be fixed by upping a few numbers in the code. But alongside that, there appears to be a timer for the levels? Those two combined with having to avoid icebergs, which I can't tell if they're randomly placed or not but I had some very close to the end point and had to make some wild turns to get back on track, meant I failed a few times just due to not delivering despite having little to no boat damage.
I also think some things can be improved like just having some interaction prompts so the player knows what they can do and kind of how to do it.
Just in general signposting needs improvement, because there's a lot of cool stuff you can do in this game: steer the ship, tighten screws, move boxes around to avoid them going overboard, upgrade pallets(?), tape up leaks, smack beavers, and avoid icebergs!
But, it's not clear in-game how to use these things or that you CAN perform the actions. There's no explanation in-game of how to handle the screws, or that they're a problem you can fix. At first I thought the pipe icon was for water leaks, and I thought the steam was just some background visual effects. I read the description so I knew how to tighten the screws, but wasn't sure what it referred to at first. But having to manually move the mouse around ala Amnesia or something to tighten the screws back up I thought was a really neat implementation and worked well!
The pallets however I never understood how they worked, they didn't seem to keep boxes in place at all, so I don't know if maybe they're unfinished? Just generally the game gives unfinished vibes, which I think makes sense since it does seem pretty mechanically ambitious. Having messed with physics interaction in Unity before I know it can be quite difficult, so kudo for even attempting!
I think there's some cool stuff here but it's buried under a layer of non-explanation, so rather than feeling like a janky shipping game where you're scraping by, it feels like I'm losing due to rules I don't know exist and are never clarified. Congrats on getting as much done as you did though!