High scores are kept via mode-specific online leaderboards. Public leaderboards are labelled as "Friends" scores, but it's just a rundown of the top performers. An option to track user scores via a friends list would be excellent; in fact, integration with a social gaming network would allow that and give weight to the game's dozen or so achievements.
Without these features Geometry Wars: Touch is obviously still playable, though it highlights the game's basic structure. Introducing customisable controls would eliminate the trouble created by the poorly placed bomb button, while expanded online features would give it a sharper edge.