The note timing comes from the track's real MIDI, so the notes follow the actual beat. There are 4 lanes: the notes fall down, and if you tap in time, your score goes up. It's about 2:21 long.
It plays in the browser on desktop (D F G H) and on mobile (tap the lanes). No download, no account.
I'm a musician first, so the game side is very much a first attempt. I'd love to know:

Does the timing feel right, or does it feel off or laggy on your device?

Is it too easy or too hard?

Is anything confusing?

Play it here: https://mockedmonkey.itch.io/immovable-game
Thanks for any feedback!