Raiden. It's a bit odd playing it in a horizontal format. Not bad at all, just... odd.
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The original Raiden used a vertical format. The screen was taller, and not as wide, so you could see the enemies earlier, and it didn't seem like you had as much left to right movement to worry about. This, of course, was the arcade version. PRetty much all of my Raiden playtime has been with the arcade machines, Mame, or Raiden III, IV, and Fighters on PS2 and 360 conroles. All of these have the vertical format as well. The TurboGrafx version is not, so it feels a bit odd to me. Still great though, in my opinion