Board Thread:Geometry Dash Update Discussion/@comment-25769875-20160101083846/@comment-25651575-20160106203547

Mirror portals aren't cool anymore. Back when they were introduced, people were spamming them like they were making money off it, but now they're just a nuisance and add very little to levels. If you've ever played old demon levels, you'll notice they tend to have more mirror portals than the U.S. government has skeletons in the cupboard.

As for reverse wave/robot, what does it matter? Just because it hasn't been done, doesn't make it worth doing, much less going out of one's way to fit into an official level. The different-vehicle dual section is also a game-play possibility best kept to custom levels - unless RobTop plans to make an entire level based around different vehicles, I don't think it's going to happen anytime soon.