This is a really fun little challenge! I'd briefly considered going with a musical scale interperetation of the theme but couldn't figure out what to do with it, but I think this is perfect! Controls are really intuitive, and figuring out how to transpose the notes you're given to match the chord is a really enjoyable challenge that I'm going to have to revisit at some stage :)
Presentation is gorgeous, love the simple brightly colored boxes with the particles, it's got a wonderful minimalistic charm to it!