It's a neat idea, but it just ends up being a waiting game where you wait for the easy to avoid boxes to fall so you can get just a little higher. There's no real strategy you can employ to speed things up once you get the hang of the game. It would be better if the game sped up as it went on so it becomes harder to avoid boxes in exchange for giving you the opportunity to climb higher faster. The instructions at the beginning are also a bit of an information dump and don't really do much to help.
Despite those issues, this is a solid entry. Nice work!