I really like the animation and model, but I would've suggested an alternative powerup sound effect rather than just using one from what I assume is dragonball. The voice quality sounds compressed too, which doesn't fit the character. Overall a good piece of work though, I really do appreciate the amount of effort you put into this, especially the model itself.
Well, it's basically - if the animation, not entirely - a SMBZ reference.
At the original SMBZ, Mecha Sonic uses DBZ SFX and the Metal Cooler voice.
There are new DBZ SFX thanks to Dragon Ball Super, but sadly, there are no new Metal Cooler voices, and the most saddest part is: there's no "I'll crush you!" or either "What!? What's going on!?" voices from him at the "newest and high quality" voice samples from M. Cooler. So, I used the original ones, which are those:
Despite that, I wouldn't be using DBZ sound effects and etc.
Thanks for the feedback! Glad you liked it.