#010 of 100 in 100 days is the real hook here. a handshake is a smart skin for a Simon game: you can mime it back with your own hands while the sequence plays, so the memory goes physical instead of just visual, and hand gestures are harder to fake than colored squares.
the risk with ten rounds is that one early slip ends the run, and almost nobody sees round seven. if a miss could slide once early on, more people would reach the part where it actually gets hard.
i'm in the jam too, "one more try" — one button, your last run becomes the ghost you race.