The game is super cool, the mechanic is innovative, and it fits the theme really well. The narration is neat and brings a real sense of cohesion to the whole concept. The frog mocking you when you mess up is hilarious!
Progression feels very natural, explaining mechanics step-by-step. Feature-wise, offering 30 levels for a 4 days game jam project is super generous (unfortunately I couldn't finish them all, otherwise I would've spent my whole afternoon on it!). :D
My only minor feedback: I would've loved a small button to return to the main menu so I could try other levels without having to restart the game entirely.
Thanks for the project, I had a fun playing it!