Stargunner is a 2D (with pre-rendered 3D graphics) side-scrolling shoot'em up game, with many elements similar to Raptor: Call of the Shadows. The action takes place in the far future. The player controls a space ship, flies straightforward to the right and shoots various enemies (including end-level bosses). Between missions, the player can visit the shop to buy new equipment in exchange for collected money. The game has three difficulty settings and four types of missions.
Stargunner is available now as freeware. As stated in the 3D Realms website: "You're welcome to enjoy playing the game, but this means that we retain copyright on the game, and you're not 'free to do what you want' with it. You can find the download link at the official page in http://www.3drealms.com/stargunner/index.html.