Congratulation with the opening of a new electro store! You have done a great job!
I like the left side category menu. And the detailed description for each product on the front page.
I guess you will add mutiple pictures for each product later on.
I would consider to add a full reflection to the product categories names in the header, but maybe fade this out.
What design template is your shop design based on? How long time did it take you to build it?