Yet another Irem shmup for you (what can we say - we love 'em), Konami's Life Force, née Salamander, is a Gradius spin-off and a rollicking good one which alternates between horizontal and vertical-scrolling stages. Juegos De 20
As with X Multiple, this too is set inside a life form, although this time it's a giant alien fighting off a virulent strain of something or other.
Life Force is a challenging beast and the Arcade Archives version includes three version of the game - the original Japanese Salamander from 1986, the renamed North American version that included narrative and graphical alterations, and yet another iteration (also renamed Life Force) which went back to Japan the following year with further tweaks. Juegos Gratis
Three games in one? What more do you want, jam on it?