Fun game, I really liked the music and the whole aesthetic. The core game loop is very satisfying and original. Neat interpretation of the theme as well.
I think the game could be improved by adding a score that increases the longer your acorn survives. Maybe some in game instructions as well, as the first time I played I was a bit confused and thought I was watching a cutscene. I also felt as though it was hard to tell how damaged the acorn was. Nevertheless you've made a great little game.