This was so delightful that my heart melted. Excellent work creating a cute game with a very interesting gameplay loop. The game is simple and elegant in its premise. I was very impressed!
My only suggestion would be to have an option for players who missed the hearts so they don't lose. I know the mechanics are solid but there is an exact frame of time that you realize you are gonna lose and there is nothing you can do because the hearts are on cooldown. Perhaps the exact center of the wooden block could be made of metal so you have a last chance? I am nitpicking tho
good job on your entry!! :)