Really pleasant all around, beautiful environments and a dope soundtrack. This is ultimately a simple platformer with Simon Says mechanics attached if you wanted to break it down.
What elevates this concept though, apart from the aesthetic qualities are the opportunities for player expression which seem subtle in that you can time your notes however you want, but feel actually really nice and the developers did an amazing job at making everything sound and feel great even with mashing of the buttons or super delayed inputs conveying the fantasy of jamming out in these psychedelic space concerts beautifully. Apart from this there are tons of options in character customization, from outlandish hyper-pop inspired outfits to flavour dialogue options that are respected throughout. Normally, this kind of player expression would be a minor detail but here it plays out to be a vital part of the whole package, tying into every aspect of the game.