Yeah, that level really made my head spin, but there's one thing that seems odd to me: at the end of the level, when you reach a "Stargate"-style portal (I'm not sure yet if it actually is one) after taking out the two bosses, the time ring in the middle of the room is there... and another, more modern-looking portal has replaced the "Stargate." Behind that modern portal, there's a time ring! I think you have to play around with the different time rings (and potentially unlock other areas of the level); either this level hides a secret level, or... well, I'm getting lost in theories... but regarding that ring behind the modern portal—you can finish the level regardless of whether you take it or not.
https://youtu.be/B4VY4LK9q\_s