Rate I would give: Epic (Legendary if it existed back then)
Is this the first RobTop level rating? In any case, Geometrical Dominator has become my favorite because its positive and fun energy has remained unmatched since its release, despite the amount of user-made clones. There's just something so nice about running across clouds and rainbows and everything else that the level throws at you. Even though the decoration is mostly quite abstract, it really gets my imagination going and I know exactly what kind of environment I'm in. I interpret the non-rainbow bits as going through multiple temples.