Meh. All I know about the logo itself is what I could find after looking up the Greek text.
I'm looking at it from a graphic design standpoint- The pentagon is black outline, white fill. The apple has color to it. The apple stands out because everything else save for the planet is white on black (or transparent).
If there are any filters or textures applied to the text (the main logo text, not "kallisti"), applying the same effects to both the apple and pentagon should be enough to dispel the apparent weirdness.
Also, up the contrast on the planet- at the moment it looks like it has weird gray halo around it.