Thanks for the feedback!
I'm gonna take a look at Alto's Odyssey, didn't hear of it before.
Since this is my first game, I was pretty overwhelmed by the workload and sadly didn't have much time to add more details. To be honest, I didn't even think about audio feedback or particle effects.
That's true, the gameplay wouldn't change even if the leaf didn't spin. But since it wasn't mandatory to make spinning a mechanic and I liked the idea of a maple key falling down, I stuck with it. I did think about making spinning a mechanic, but it felt forced so I decided to scrap the idea. If it had been a mechanic, it would've fit the theme even better, but the gameplay would've been worse, so it wouldn't have been worth it