Thank you for listening and for your comments!! :)
To be told that it reminds you of Yasunori Nishiki's work made my day. He's such an amazing composer. I'm not really adept at music theory, but I love the major chords, so I tend to listen to a lot of major-chord themed music. I guess that's how I became a bit familiar with this type of cheerful style. Thank you for your thoughtful observation :)