I gots me all the pc engine shootys except ones..Legion, I'm only going to list some of the top shooters.
Winds of thunder: best shooter on the system, great gameplay, 16 bit graphics at their finest, and music that gets you into the action like no other.
Spriggan Mk II: This is the coolest most epic shooter for the pc engine, what makes this shooter cool you ask, OH HELL NO YOU DIDN'T....well lets start with a rainy night over a city with lasers in the foreground and background destroying the city and any one who cant get out of the way in time, foe or friend, as the storm lifts you can see the damage the city has taken...unique explosions for different environments, the last fight is a sword fight
Spriggan: Best vert shmup on the system.
Gate of thunder: compared to its sequel, i think its inferior in every way, another thing is its unbalanced difficulty, it starts out very easy then all of the sudden BAM, like a big one in your face, it gets hard...and don't any of you act like you haven't been in a similar situation, but still, the game has great gameplay, graphics and music and should be on any top 10 list for the pc engine.
Other top tier shooters are, Saphire, Nexzr, Forgotten Worlds, Macross, Magical chase, Soldier Blade, the list just keeps going, the pc engine is truly the king of shooters....well, of its era at least, i haven't played many shooter past 1995.