So the combination of tetris and an infinite runner is a real brave approach. If Ninja could jump over a length of at least on block, it would feel a bit quicker, but without jumping you are placing a real interesting challenge here.
I was not sure, where a block exactly can be placed on, seemed that you had some position issues? If that gets a fix, I would definetively come back to give it another shot because in general i really liked the idea.
Could it be that there were some issues with the drum samples of the music? They came out but sounded like dirac impulses. Maybe an Envelope Curve on the samples for the volume could fix that problem. Or are there issues with the file format?