Interesting gameplay,  if you could add a randomiser to the boxes speed could make the game less predictable.

Maybe i have to hold down space bar to get more height out of my jump, so you can add more boxes in quick sussession so the game requires some more thought and skill.

A cool idea and the level looks very nice.

I think things like a score,l music and a variety of speeds on the boxes would make for a really fun game!

I like the idea. The box could do with some random variation for speed and timing, or maybe it gets faster and less predictable over time. 

Good concept and responsive gameplay. To make this game better I would focus on 

1). Adding a restart function after you die.

2). Adding variety in the level. For example, having the boxes move at different speeds and after different intervals.

As an added challenge, try to have the player look downwards as they jump.

Nice game! I dig the tree placement and how the box functions! The end game screen blinded me and illuminated my room in purple; But outside of that your game's pretty solid! :)

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!