Very fun!! The risk/reward of staying within the zone to increase you're score is very engaging- I like how effectively you are able to encourage the player to move in a loop without forcing them too- very neat and satisfying! Also really cool you added a high score system- we thought about doing that for our game too, but ran out of time.
I don't know what engine you used, but I did notice that a lot of the sounds would cut each other off- I'm making a lot of assumptions here so this might not be helpful, but a lot of times that happens because in many engines Audio Sources are only able to play one sound at a time, so in order to play multiple sounds at once, you'll need multiple audio sources. Something to look at for future!