Blade Buster, a new NES/FC homebrew shoot’em up from Japanese doujin group High Level Challenge Project. You can download the ROM here (NES emulator required).
It’s a two-minute score attack/”caravan”-style game, meaning it’s a short shmup that’s more about getting as high a score as possible (and as far as possible without dying) rather than trying to get to the end.
Import: Game Center CX 2 (there’s a score attack version of the already-awesome Star Prince in here!)
See also: More doujin projects