Wow, this one is suuuuper fun! Definitely one of my favorites. The only level I wasn't able to beat was nr 8, but thanks for giving the ability to jump to any level, which let me see the rest of them. How did you do the water simulation? Anyway, I loved the concept, and the environment, and, of course, the remote control boat. Great job!
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The water shader was stolen from the godot demo projects compute texture demo. I modified it a bit to add vertex displacement and to read the values back in cpu land so I could use them for the buoyancy stuff. It's open source with the repo link on the game page if you want to have a poke around.
Level 8 was definitely a spike, I think I might remove it after the jam!