CrossFire EX [クロスファイアEX] Game Sample - X68000
A vertical scrolling shooter made in 1994, and reported to be the last game O/S Software would make under the "O/S" name, before becoming the doujin circle "Blue&White", who have made successful doujin shmups like Tails Gear, Blue Sabers: Operation Orbital Hammer, etc. It's interesting from a historical aspect, but it's honestly a very mediocre game.
I think O/S Software's "Blue Wings 2: Blue Knights" for the X68K was much better from a gameplay standpoint, as there isn't much to do in this game. Just shoot and lock on to enemies below you, kinda like Galactic Attack, but not even a fraction as pretty (we're talking reaaaaally simple graphics, even compared to what the X68K was capable of), though the soundtracks have been consistently pretty good from the O/S Software and Blue&White games I've played. It's not bad, just don't expect much.
This is a video of the game in action. Enjoy.