You've included a lot of really cool bits of polish like the transition from the menu to the game and the mini map. I'm also always impressed when a game made in such a short time has sound effects. It would have been nice for there to be more of an objective, even if it was just a win screen when you reach 100% exploration. It feels a bit more like a character controller demo than an actual game.
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Thank you! The sound effects and the polish are what I spent most of my 3 hours on, so I’m glad it’s noticeable.
I’d also like to mention that there is a win screen, if you go back to the submarine after exploring everything then you get said win screen. I did write it in some text at the start, but that’s pretty easily missable since it disappears fast and I didn’t make it very clear that you needed to return to the submarine for the win screen.