Combo Crew is an interesting experiment that just showed up this week on iOS. Beat-em-ups and fighting games are great on consoles, where you've got plenty of buttons and d-pads to pull off various moves with. But while they've appeared on iOS a few times (Capcom's Street Fighter 4 has done fairly well on the App Store), usually these games on a touchscreen tend to just fall back on virtual buttons, which are generally way more clunky and less precise than physical moving parts.
Combo Crew, however, is an attempt to make a beat-em-up redesigned from scratch for the iOS touchscreen. It's a game made by the Game Bakers, a really excellent team b