Oh, by the way, for difficulty, the game doesn't seem too terribly difficult in terms of beating songs. I have come across some songs that have a background that really screws with my eyes and makes the line hard to follow, but for the most part, the backgrounds have been a nonissue. Songs do seem to be rated on a scale though of 1 to I don't know to represent what I presume is their true difficulty within their general difficulty. For example, one song may be rated 1 for easy, 3 for medium, 5 for hard, while another may be 3 for easy, 5 for medium, 7 for hard (examples, as I don't have the game in front of me to quote at this very moment). Basically, the lowest difficulty score becomes the easy, next up is medium, after that is hard.
I do have to say that I spend most of my time with the touch mode, as for me, that is a very fun and rhythmic way to play. Button presses really throw you for a loop if you spend too much time with touch, and trying to jump right back into multi-beat touch after taking a break can be difficult. Overall, the hardest part is mastering songs. Sure I can go through a song on easy and get 98% first try, but that isn't 100%. I can go through a song on medium and get 95% first try, but miss out on SP notes. Things like that provide extra replay time not just for beating songs, but for mastering them. For getting 100% Cool, S+, all SP on every difficulty on every song for both touch and button modes.
I know the game may come across as easy, but it's like with any other rhythm game. You may be able to beat a song, but few people are truly content until they 100% the song, or get as close as they see as possible.