There were lots of Arcade games I would like to see ported on Amiga... as long as they were made by teams like Storm or Ocean France or Graftgold, not Tiertex or Software Creations etc
First, Most toaplan games shooters could had been done on Amiga... at least the ones that were ported to Mega-Drive, could hade been done. Someone mentioned Slap Fight, which should had been ported (the C64 has a pretty solid version of it). But we could had have Truxton, Hellfire, Grind Storm, Fire Shark... geez, even some games that were only ported to more superior hardware could have had some good scaled down amiga ports like Truxton 2 and Batsugun (Now that would be really interesting to see someone trying, it would need a LOT of scaling-down to make it work). Fixeight and Outzone would be good games on Amiga too. No need of Zero Wing, "All your Base" aside it was a pretty mediocre game.
Power Spikes would be perfect for Amiga, the arcade game uses only 1 button and it could have been easily ported IMO. I would have played the hell out of it. Also a game that didn't get one decent home port (The SNES version is just too slow, while the Mega Drive only got the previous game on the series, Super Volleyball)
Puyo Puyo would be an easy one to do too, and a very good game.
Some Konami arcade games would be good... Gradius I and II, Turtles in Time so the Amiga could have at least one good Teenage Mutant Ninja Turtles game. Also I would KILL to see a well-made port of Sunset Riders.. I really think Amiga could pull it off by scaling down graphics and nothing else.
Someone said Captain Commando, and that's another one I'd like to see, as long as it wasn't produced by US Gold and not coded by Richard Aplin
King of Dragons, Knights of the Round and the arcade version of The Punisher would be pretty cool too. And one that didn't get any home ports ever and its one of the best games ever on this genre: Cadillacs & Dinosaurs.
I really think all those games could be ported to Amiga, if the right compromises were done and good solutions for 1-button controllers were aplied. I *really* think they could be done.