This is another that I have a rocky relationship with. Being arguably the world's first cute 'em up the game is nice to look at and sports some good tunes (especially the arcade version's FM synth.) It's the Defender-style gameplay that gets rather irksome. Every time the ship changes directions the scrolling takes a sec to catch up usually leading to mid-air collisions. Furthermore, I know zero souls who enjoy the limited-time powerups.