For a first game, I think it's OK! there is beginning, middle and end! I confess that the game is very raw! you should put some sound effects to draw the public's attention.
I'm reading the reviews, and I agree with them, but use them as goals of what you should do. I am a user, not a developer. Many think about making a game, but only gets in the "one day". You at least produced something! I do not know how much you dedicated yourself to this project, but if you dedicate yourself more, you can come up with a great project.
Points that I would modify:
-As soon as you start, just drop off the platform and head towards the end. This is boring! Put a bigger challenge!
"I really appreciated the idea of the box that haunts you!" But it goes straight. Maybe you can make his trajectory with a tangent, and even make the player jump ... it would be very cool to earn points by deflecting this box! (you get the idea of putting on a slow motion effect as soon as you jump on it, and maybe even do a stunt)
-The bottom is very static ... and it tires! instead of putting it still, make a soft animation, to give a stimulus to the player.
-The box that walks is cool, have you thought about putting faces on it?
-The box that chases you, can put a face too ...
-The most important thing for a game is to exist a "why" ... Why am I playing this? make a story, even if it's a cliche ... (the bully who wants to hit me / the thief who is fleeing the police / the guy who found the woman's lover in the closet and wants to hit him ...) put a story that of a joy and mission for the player!
i think that your game is 1,0 star at least in this stage... try that hints and post again! I belive that you will do a great work!