Like I've said before, I've beaten the last boss in the challenge mode but not in the arcade mode, which really rankles me. I still have it listed as unbeaten in my backloggery. It's just so dang hard! But man, I do love this game. The graphics and music, the challenges, all the little extras—it's a fantastic love letter to the series. (You're right about that emulation though. It's just not quite right.)
I'm glad you liked the game. I just wish I'd been able to play the co-op but then you need two copies of it. It sucks that we might not ever see another Contra game like this, but at least we have Contra 4.



Though if I remember right, you don't have an iOS device new enough to actually play games...?