I still have some really looking around the site to do, but my immediate response to the overall design is that I like the sidebar but it is so wide that the rest of the page (i.e. the content you came for) feels crowded and shoved over into a smaller space. Since none of the actual text in the sidebar links gets too long you could definitely stand to thin it up like 10-20px and not lose out on anything over there.
I do really like that everything is clearly labeled and creating an account (as I did to make this post. Boy why didn't I make an account years ago....) was super easy to find and do, so that's a plus! (And maybe it's just because I'm working on an Apollo cosplay at the moment but the color scheme reminds me of him haha. That's neither here nor there, just an observation.)