Although I'm not the biggest fan of the game (or the series for that matter), I thought New Leaf's soundtrack was exceptional. There were some incredible musical compositions in that game, particularly at night. I would often play it at different hours during the day just to catch ones of the tracks, or sometimes just to hear it transition from one theme to the next. The music in that game is perhaps my favourite take away.
I also really enjoyed the soundtrack to Fire Emblem: Awakening, but I honestly can't bring anything to mind at the moment. I do remember really digging it though.
I also thought that the music in Luigi's Mansion 2 was awesome. It struck the right chord of whimsy and haunted house, and I recall the music in that game being really quite dynamic in that it would react to how you played. If I'm remembering correctly, the music would include beats which corresponded to Luigi as he tiptoed around, and included jolts of sound when something surprising happened, and of course there was the fact that Luigi would hum along to the music (an acknowledgement from the Next Level perhaps that the music in that game was exceptionally catchy?).
Here's one of my favs! (although the below is a remix, I think it adds a new level to the already excellent track 'Outlandish Interruption')
Although I only played it for a few hours, I also thought that Rayman Legend's soundtrack was quite enjoyable. The renditions of licensed music in particular stood out to me (that Mariachi version of Eye of Tiger had me giggling like a kid).
As you might expect from Rhythm Games I also really liked both Bit.Trip Runner 2 and Harmoknight. Getting music to meld with gameplay might seem like a no-brainer but having played some terrible rhythm games I can tell you that there's a world of difference between a good rhythm game and a bad one, and both Bit.Trip Runner 2 and Harmoknight were really fantastic ones, and much of that has to do with their music and how it was integrated into the gameplay.
This song kicks ass.
More recently I've also been really digging Resogun. Each level has it's own unique sound, but the music of each stage also build in intensity so that by the last level the music perfectly matches the difficulty. On more than one occasion I have tried to take a moment to try to appreciate the music only to lose focus and smash right into a roving enemy ship. The music is arguably too good is what I'm saying.
I really like this one.
I also recently played Soundshapes and have had a big smile on my face since hearing this track. It's incredible.