Very unique !
It's pretty, it's cute, the music is simple yet effective and the game is so straight forward, great job !
The only issue I had was that sometime the frog in 2nd stage of growth would glitch out in the ground or in grass colliders, so I was forced to restart the levels.
I believe that adding some VFX when swimming and jumping would definitely add a lot, however that may become to much cuteness for my heart to handle !