I love the twist you put on it. Putting it underwater really made it feel fresh and new. Pair that with your art style? Really well done.
One minor suggestion: the water/swimming noise got stuck on loop on both playthroughs and got a touch overwhelming. May just be personal preference, though.
Read the issues on movement below. I actually didn't have any problems. Felt good to me.
Overall: great job, Ema!