Very good creativity for the icon with the "B" . I like the "Play" shape rather than the cube...
Could you see what you can do with other fonts or other dispositions (I don't know maybe a superposition...) ... But keep the idea of a triangle/Play Shape and the Blue Color.
#52 is the best for us. Could you try some improvements in therms of color light/ Glare ? to have something pure and more sophisticated... Just to test.
The # 128 is the Winner. Could you do a white background version when you will sent me the files. The grey Color in the #62 was good. And if you can play with the lights and opacity like you did it for the #128.