Very nice visuals and satisfying physics. In the first level I got stuck at the whirlpool just before the gator and it's only out of pure luck that I was able to escape and make it to the exit. Because of this, I believe rebalancing some parameters could help give the player better control.
I would also recommend that instead of pressing some buttons for levels 1, 2, and 3, we are just taken to the next level after completing the previous one.
Jumping on the hippos was very satisfying! I hope you make more levels. Overall, nice game.