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Gemini  AI was used to write the lyrics to the soundtrack, after a brief of the game was given to it. I asked to make it funny. Then Suno AI was used to put the lyrics into a song.  I couldn't get the right feel for the tune but put in something that is sort of cheery and fun. The lyrics is rather funny, and it's about a little crab wanting to fight his way into clean waters to look for his family. The AI added some tussle with a boot and a straw, but I didn't add them as flying objects for Sweaty to dodge as he's already got enough in his claws to evade those pipes ;-)

(Verse 1) 
There once was a crab named Sweaty, so small,
Washed out to the trash, he'd lost his all.
Plastic bags swayed and old tires did roll,
"Oh, to find my folks and escape this black hole!" 

(Chorus)
Swim, Sweaty, swim, through the pipes so grand,
Heave ho, little crab, to the cleaner, clean sand!
Don't get stuck, now, or you'll be in a jam,
Soon may the Sweaty Crab find his dear fam! 

(Verse 2)
The pipes they loomed, all rusty and green,
A challenge for Sweaty, the bravest ever seen.
He wiggled and jiggled, with claws held up high,
Dodging old bottles that floated on by. 

(Chorus)
Swim, Sweaty, swim, through the pipes so grand,
Heave ho, little crab, to the cleaner, clean sand!
Don't get stuck, now, or you'll be in a jam,
Soon may the Sweaty Crab find his dear fam! 

(Verse 3)
A rogue plastic straw tried to block his swift way,
Sweaty just chuckled, "Not today, no, not today!"
He squeezed past a can, and a shoe with no lace,
A determined young crab with a smile on his face. 

(Chorus)
Swim, Sweaty, swim, through the pipes so grand,
Heave ho, little crab, to the cleaner, clean sand!
Don't get stuck, now, or you'll be in a jam,
Soon may the Sweaty Crab find his dear fam! 

(Verse 4)
The current grew strong, and the pipes got so tight,
Sweaty held his breath with all of his might.
He saw a faint sparkle, a glimmer, a sign!
"Cleaner water, at last! Oh, this journey's divine!" 

(Chorus)
Swim, Sweaty, swim, through the pipes so grand,
Heave ho, little crab, to the cleaner, clean sand!
Don't get stuck, now, or you'll be in a jam,
Soon may the Sweaty Crab find his dear fam!

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I've also used Gemini to draw many iterations of Sweaty. Canva (not paid) helped with its free assets on seabed.

A shoutout to Sweater Cat Studios' excellent very easy to understand tutorial on Flappy Bird in Godot 4 .4 

I've re-used his pipes with color and size changes. His video ought to get more views. Please watch his video.