Maybe in the footer do the social links inline with tooltips? That’s the only thing I can think of. It looks good. The reason for it being rejected might be because of over-submission of all the one-page themes.
Nice job! Wishing you many more paws.
Geko, you have a great start, but one major thing I see here for you to improve is your typography. Your typography needs work, especially in the navbar and other parts of your theme. Look around ThemeForest and Dribbble for some awesome examples of typography. Also, all your elements (divs) seem really cramped. Try some spacing and padding. Finally, there are a few places where you could improve on your design, but as I said before, just look around a few websites for that extra bit of inspiration. You are much closer than others, good luck.