I think the BTN is still the old icon. Or maybe my eyes are just playing tricks on me.
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I am, by no means an expert; but it seems to me as if the lightning coming from the ball in the center could have more randomness to it. It seems now to go in a saw-blade like pattern, I don't know if that was intentional or not, but lightning is random. Perhaps move it around a little? Create some more jaggedness to increase the effect as well!
These are minor changes though, and not really necessary. Just my thoughts!
Without these changes, I see fit that the icon deserves a
4/5. I like it