Absolutely amazing game, but it's way too hardcore. I can't beat it. Nonagon Infinity is one of my favorite musical albums of all time, so I really recommend at least an easier difficulty. If I had to beat Robot Stop to access the other levels, I wouldn't even try. It's way too hard right now. But I'm very interested to see how this improves, I love the idea of "music video games".
I hope to see even more genres like a top down shooter, doom-style fps, endless runner, galaga-type shooter, and etc!
All and all, I love this so much. Please make every new screen a checkpoint and the timing a bit easier like what Temmieneko said. That would help so much. If you want help in any way, I can do audio mixing, video editing, and anything like that!