Alright, I like the kind of aesthetic you were going for with this yellow/orange to dark blue contrast, though I must admit, the controls are kind of finicky(Boat slows down seemingly at random, it's unclear what hurts you and what doesn't), and it was somewhat unclear what individual level elements(like the treasure or crabs) do. You just need to work on clarity, everything else is okay!
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Hey, thank you for the feedback. The speed thing you are seeing might be when you get tangled in the weeds in game. They slow the sub. However, if you are not able to tell this is happening it leads to your second point about signaling changes and attacks to the player. I think I need to add more descriptions to the menu tutorial and also try and add more animations and sounds to let the player know what is going on. Given more time I think I could polish that up.