Cool game :) made it to 396 then got stuck. It feels like once you get stuck you basically need to start over with trial and error, since the whole structure of your song is affected if you start changing notes.
Viewing post in LoopRunner jam comments
Yeah, the fact that a tiny change to the sequence causes a ripple effect that can ruin the run is an issue. Like others have suggested, I think having some kind of checkpoint system (along with more levels of course) where you just have to make it through a few loops and then you can change it for the next section would be better.