Nice game! like that you went the 3D route, sets you apart a bit from the other similar games here.
My feedback would be very similar to what has been covered on those games as well, mainly increasing difficulty over time, either by spawning more boxes or by some more creative means, as well as having a scoring system keeping track of how many boxes you've avoided. Also a way to restart the game after dying without having to close and reopen the whole thing.
Good job!