Wow man, you're really damn close to making a really fun and challenging game for mobile here. I think adding a bit more polish to make things look more like you're a frog, some effects on collecting these things, maybe adding a bit of perlin noise to the flys to make them wave around more like flies, or just animate them and put a background, then throw it up on a store! It's perfectly simple & I would be proud.
At the present state it's just passable enough for a game jam, and I think you found something cool! I really like micro-adjusting my hops before hitting that jump, good job implementing the long-hold to jump higher mechanic too, I find that to be tricky to do right and it feels good.
Would really appreciate your feedback/rating on mine as well :)