Captain Dynamo, looks, plays and sounds great.
Chronicles of Omega, while not a good game by any stress of the imagination, scrolls and plays smoothly enough.
Jim Power, just don't put it against the Amiga, it really loses a lot in the graphics department, but I believe it plays extremely similar.
Metro Cross, runs at 50/60fps most of the time.
Navy Moves/Arctic moves, look great and are kind of smooth.
Spellfire the Sorceror, though it plays in a box, it's cool with nice parallax.
Ghost Battle, great graphics, smooth scrolling though the action is kind of slow.
Stormlord, good scrolling, beautiful graphics. Not my kind of game.
Flying shark, is really well made.
Lethal Xcess, nothing more to say really.
Fernandez must die, is a good commando clone. Runs well enough.
P47, though some people might have an objection about the scrolling, it's a really great game.
Critical Mass, it's a non commercial game that is one of my personal favourites. It features smooth parallax scrolling and it's quite different from most ST games. Kind of repetitive though.
Frantick, another non commercial game. This is like a 2d Tempest. I love it.
Just a small list for now. Maybe I'll get back to it.