Just did a replay and this game still holds up even though it's an older one. One thing to be careful of if you're going for the Rock Superstar ending, make sure under the "relationship" tab in preferences that all other girls paths except Melody's and Sophia/Xianne lesbian path are turned to "locked" even though I've played it before and gotten Superstar ending (plus all the others except Amy who I never cared for) it wasn't allowing MC and Melody to open for Koko. Turns out that, even though I broke up with Izzy, the relationship flag still showed unlocked. Clicked it to locked and, lo and behold, opening for Koko.