A one-thumb arcade game with a sharp core loop

MAGNETAR is a one-thumb polarity arcade: a reactor core sits at the center as crystal shards of two polarities — cool cyan and warm amber — converge from every direction. Tap anywhere to flip the core's polarity so it matches each shard as it lands. Matches absorb for score and build a combo multiplier; a mismatch breaches the core. Speed and spawn rate ramp up over time, with occasional 3x "core shards". Radial layout plays identically in portrait and landscape, with cloud-saved best score and a shared leaderboard.