Retro Game Challenge came out a year and a half ago in Japan as Game Center CX. You may have heard of it back then. It was an awesome game and it still is now. Better yet, the sequel's coming out a few days from now! This time it has an old-school adventure game and RPG on top of the other genres!
As for US-made games, I recommend Big Bang Mini, the fireworks shmup. Counter to the review on this site, I think it's easy to control and the separation of screens is natural and well-considered. Better yet, its really original, has lots of content, really works the fireworks theme and is challenging in a different way than most shmups, since missed shots create debree you have to dodge. Also watch out for Henry Hatsworth and the Puzzling Adventure.