This is nice. As Mashup has said, there is very little reason to go small. Perhaps some sort of enemy that follows you down could add insensitive to go faster. This is a nice start though, keep it up!

Apart from being faster, I didn't see any benefit in being small, especially when it made yourself a whole lot more vulnerable as you move down so quickly that you have no time to react to a shark appearing until it's too late. And not sure how i felt about that sound effect at the end of each level haha. But interesting take on the theme.

Cool game! You should check out TextMeshPRO if you haven't already though lol. Awesome job :)

This is surprisingly good