Skipping the things others said already - on first encounter, when I used Spin exactly on the current position of the Frog the game bugged out. The Frog froze in place, didn't make attack and game became stuck.
Also it needs health bar or something.
The graphical style and animations are going in the right direction. They're very nice and playful and a little bit mysterious.
Boss attack being just fill bucket red feels out of place, it should be something different that fits with the rest.
That turn to stone moment was pure kino.
Do you have idea for what type of gameplay you want for this?
To me it feels like it's suited to be a puzzle game, where you figure out proper positioning and order of attacks. Like for example "figure out how to end this fight in 3 moves or enemies kill you". Each encounter being a unique puzzle.
There are elements of that in the boss fight already where at first you just react to boss making attacks, but then when you figure out the blinds spots and safe spots where you can compensate with heal.
This is very promising and I enjoyed it.