That was a fun game. Really enjoyed to play.
Unfortunately, it seriously lacks ambient and SFX like wind, drone propeller sounds, lightning ets, simply music.
For the future you should consider adding those aspects as they are very important for the game perception.
A few resources, that might help you achieve that.
Royalty Free Images/Music/SFX Pixabay
https://freesfx.co.uk/sfx/stone