Love this theme!
It does need updating though, as it is many years old, and standards have changed a bit.
While I am still using it on my live website, I'll be changing themes so I can have responsive, and mobile.
Mainly, though I'm switching themes, as php and wordpress code base has changed quite a bit.
To be clear, my ecommerce website Does still work with Acoustic. Though drop-down menus don't work on mobile.

Author response
Hi there,
Thank you for your feedback, it's much appreciated! Just wanted to let you know that there aren't any known issues with menus on mobile, so if it's something that happens on your side only, feel free to open a ticket on our support site where our team can assist you. Thanks
I love all of the Pexeto themes. They are easy to work with and gorgeous.
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