It's a cool game! There are some tips I would like to give you.
1) I would recommend making it so that the music continues playing after you die, and not reset. This always makes a better experience.
2) I would make a loose screen, not a complicated one, just a simple you died screen. This allows the player to understand what happened.
3) I would make the player more fluid, by adding friction. There is a friction material in Unity as far as I know.
4) You could make the falling boxes have a spawn animation so it's not sudden
Overall, good entry. With some work, this can be a good game!