Aesthetic is more or less "Visual Appeal". The colors in your menu to be honest, don't look all that great, they kind of clash, and really detract from the menu. Make note of the relaxing purple tones that are used in the JJ2 menu. Its easy on the eyes and does not distract the player from what he should be doing in the menu (i.e. selecting stuff)

Also, the font you're using for the menu lessens to the visual appeal of your menu. It is also a little bit hard to read, and can easily get lost in the current mishmash of the menu's background.

I suggest using the ingame font of Jazz 2 (easily extractable using Jazz Sprite Dynamite) and constructing your selectable menu options in an image editing program. Or better yet, have someone do it for you so you can work on the actual game engine. I'd do it myself, but I'm currently rather busy.