Very very fun! I like how there are a couple areas that you can only access by digging and alternate routes if you choose to explore. My best time ended up being about 15.5 which I was pretty happy with. Destructible terrain is such a cool mechanic for any game to have, and you made it feel really crunchy and impactful which was great! One thing that feels like it would fit perfectly into the game is having the frog tongue SMASH through walls when big like a huge tongue punch.
the only issue I ran into, was it was possible to soft-lock yourself if you dug a hole while big that's too deep to jump out of when small, but that's sorta in the nature of the terrain destruction aspect of the game, quite hard to avoid. Plus only weirdos (me) who are trying to find secrets and master the mechanics of the game would really ever run into that so I don't think its a very big problem.
Really fun, really cute, good work!