This topic said it includes other beat-styled games but I haven't found a thread about one lol. The only other game I can think of is gutiar hero and ik there's some knock offs of that game. Do you know any other games similar to osu?
I am surprised that no-one recommended trying Volumax. It's still on Beta and very fun to play You should try it out, there's not even too many active players there so it's going to be easy to get high rank. I really hope that Volumax is going to get more attention soon :X