Fast-paced shooter with a very fluid gameplay. An obvious reference to the "Geometry Wars" graphics, which I don't mind, since "Helinon" is simply a well-made game.
Music fits damn good, the auto-fire function is smart and the upgrades (bullets, special weapons) are really helpful, not just some gimmicks.
Only things I miss here are medals or at least an NG-highscore-board to compare with other players. Still a very enjoyable, action-packed time-waster!