I think this game has a lot going for it. Visuals are great soundtracks are great UI is decent but the gameplay is not very fun for me due to the fact that all the notes seem to not be synced to the music. I played the browser version and this was immediately apparent as someone who doesn't play many rhythm games it makes it very difficult for me. I checked out your youtube videos and all the notes still appeared to not be in sync in any way.
Moreover please reorder your song list from easiest to hardest, and you could change the difficulty sign to different cats like happy cat = easy angry cat = hard or something.
There's a lot of cool stuff you can do with this and am excited to see how it goes will definitely be coming back in a couple months to see the progress good luck.