So, let's get the unfortunate out of the way first: it kept crashing. This happens. It's a jam. I tried multiple browsers and all work, until they don't.
On to the good! I love the light atmosphere and think you nailed the speed and feel of the balloon! It controls nicely and is just fast enough to not feel slow but also not so fast that it makes the world feel small. Good balance.
I would love to see this developed further! I got inspired with lots of fun ideas, like allowing the player to use momentum created by spinning the claw around to throw animals far! Alternatively, use that mechanic to complete secondary objectives like throwing trapped animals out of where they are trapped, or to break down barriers that prevent rescue. Lots of opportunities!
I would also like to see you double down on the humor and give the animals different "voice lines" that trigger at random, at appropriate times. For example, while they make animal noises, they can also scream if dropped from high altitude or have a rare chance to say "neigh, I'm a horse" or something when picked up. Give them googly eyes, also! That react to momentum! Watch those eyes spin!
I leave you with this game design nugget: The goal of level design is to let the player use their mechanics. That's the number 1 goal, anyway. Therefore, i would recommend you explore ways to use the current mechanics in interesting levels. Let the player lower to go under a bridge and raise themselves high to avoid thorny bushes. Let them swing their claw to break down barriers or pick up and throw rocks at cracked walls. There is SO MUCH you can do and I wish you the best of luck!