Shmup with the ability to reflect enemy fire (think Giga Wing but no cooldown and it only works against lasers). The ability uses a rapidly recovering resource, so it's a major focus off the game. You don't even have the option of avoiding the homing or giant laser attacks. Timing it so as to expend the minimum amount of resource is a skill that takes awhile to develop and is necessary in later levels where they are constantly throwing homing shots at you. Hence the name reflex.

Beyond that it's a by the numbers shmup that offers nothing that hasn't been seen or done a million times, in many cases better, other than the neat little story bit near the end.