i LOVE this game. went and Double S'd every girl. Ruth definitely made me work for it, but she's one of the best tracks anyway!
One major criticism though: The "Double" modifier should NOT be in cut time. It's more then enough of a challenge to have to split your focus between two bars - but also doubling the amount of notes you have to hit on top of that turns it in to the only modifier that's an auto-skip for me no matter what. Which is a real shame, because Fission, Hold, and Mine are amazing and really fun to put together in the same endurance run.
Other then that, looking forward to buying the full release! This game grows on you fast, it's really something special.