Darius Twin

Darius Twin is a side scrolling shooter similar to other games in the Darius series. You'll fly through a series of different stages, each with numerous enemies and ending with a large boss. Similar to many of the Darius games there are different routes that can be taken towards the final stage. At the end of each stage, you are shown a map and can select the next stage you would like to complete. (mobygames.com)