Geometry Dash Stars is a rhythm platformer in the one-button mould: your character moves forward on its own and you tap to jump, with the obstacles laid out to match the music.
These games look unfair and are not. Every level is fixed, so a section that kills you ten times is the same section every time, and the tenth attempt fails a little later than the first. Progress here is pure memorisation plus timing, which is why finishing a level feels earned.
One button or one tap is all it needs, so it plays fine on a phone or a desktop. Runs in the browser with no download. Sound on is genuinely helpful — the jumps line up with the beat.