What's a good iOS game that's got a killer sense of rhythm and a cool, kinda retro vibe?

Seriously, *Friday Night Funkin' - FNF* is addictive! The information architecture is surprisingly solid for a rhythm game, making it easy to jump right in. The character designs are all super unique and give off this awesome old-school arcade feel, which I'm totally digging. And those hover states tho? *Pixel-perfect*! Plus, the difficulty curve is really well-balanced; it's challenging enough to keep you engaged, but not so hard that you want to throw your phone across the room. I appreciate that it doesn't overwhelm you with options right away. It just throws you into the action, which is great. Overall, it's a really *design-forward* game that respects your time and attention. The developers clearly put a lot of thought into the UX.