Cho Ren Sha 68K is a nice and fast paced vertical scrolling shooter with lots of bullets to dodge and 3 different powerups to collect. You will also encounter big bosses at the end of each level that are needed to be destroyed by the lasers of your powerful little ship. Fine game!
Link to Gameplay Video (Pixel Prospector)
There seem to be major sound glitches when you try running this on a computer with either multiple cores or hyper-threading, but running it through RunFirst (http://www.activeplus.com/Products/RunFirst) seems to fix it, at least for me.
This is one of my favorite shmups, both for the game itself and the really awesome soundtrack. My only two complaints are that there’s no windowed mode (that I know of), and no auto-fire either (mashing the Z key gets really tiring after a while).
If you should have a Gamepad you could use JoyToKey.
(It enables you to play any game with a gamepad…and you can also create autofire commands and stuff)
The program is freeware and no installation is required.
http://www.electracode.com/4/joy2key/JoyToKey%20English%20Version.htm