Really enjoyed your game, well done! Definitely one of the most creative ones I've seen, and I particularly loved the ending sequences to each level.
If you expand upon this, I would recommend introducing some less punishing save points, as it's easy to feel like you're soft locked when you make a mistake, and goes against the otherwise very exciting and energetic gameplay.
I also found there was no reason not to hold down right click at all times, which simplified gameplay a lot. Some options I see are:
Remove the need to hold the button and just have the fish scale up automatically (keeping the hype train but lowering difficulty)
Temporarily increase linear drag while inflating (Hype is more dependent on skill)
Make inflation unavailable for a short time after deflation (less hype, more puzzle focused)
It was my first time working with Unity's audio system, and I initially couldn't figure out how to increase the pitch of an audio clip. Seems amusingly trivial looking back, but I love the rabbit hole it took me down.
