DemonStar - Secret Missions 1 - description from Softdepia.com:
The Xidus have been developing in secret new, more powerful DemonStar ships to destroy Earth. Your job is to battle your way through hordes of new enemies, and destroy their devastating new weapons!
The first in the new series of DemonStar spinoff titles using an enhanced version of the original engine. Secret Missions 1 is DemonStar infused with arcade quality graphics, sound FX and backed up with all new levels and music soundtrack.
DemonStar - Secret Missions 1 is a "Free to try" program. You can download and try it for an evaluation period.