5:16h. Did not look for music sheets but completed all optional side areas. As I usually do, I'm counting every campaign as a separate game, since they're sold separately as standalones and they're more or less the same length.
Shovel Knight is considered the "holy grail" of retro indie platformers, and it's easy to see why, since it's some of the finest 2D platforming this side of Nintendo. Particularly the last two areas, which are really challenging and fun. The game might be a tad easy, but the fact that you can "break" the checkpoints for additional challenge and reward is a very novel and interesting idea.
While it's a better Megaman game than most actual Megaman games, I personally think Shovel Knight is missing "something" to be amongst the truly greats. Maybe some more variety? Some extra length? In any case, the game is still a must.
My Score: ★★★★☆