Bad Hotel is a great game that you may have missed on the App Store earlier this year. I certainly missed it, though since it arrived (back around August), I believe, it's come up a few times in various game design and game reviewer circles. It's a weird mix of music and gameplay that is definitely easy to recommend, but hard to actually describe. The best way for you to see how the game works is just to go play it, so throw 99 cents down and go grab this one for yourself.
Still here because you don't want to spend a buck without knowing what it's for? Fine then. Bad Hotel is probably best described as a weird sort of tower defense game, where you drag and drop various sacrificial additions onto a hotel tower, trying to defend it from incoming attackers (mostly birds, though I hear things get mixed up later on).
But that core mechanic isn't the only thing happening. Bad Hotel is also a sort of musical instrument. Each room you drag onto the hotel pulses with a musical noise, and as you put more and more rooms out (and more rooms get destroyed by attackers), the music changes and warps as you play. It's really fascinating -- it's hard to explain just why this mechanic is attached to the music so strongly (you don't get points for matching up with the music or hitting anything in time, as in a normal music game), but again, the best way to see how well it all works is just to play it and explore for yourself.
A recent update for the game opened up all of the levels completely, so now anyone jumping in to play has more options than ever for what they want to see. Bad Hotel is definitely a weird title, but a great one. If, like me, you missed it during the release, don't make the same mistake now.