4-D Warriors

4-D Warriors is a side scrolling science fiction themed shoot 'em up game where you take control of a guy in a spacesuit with propulsion and armed with a gun.

You fight a variety of strange alien creatures including mini bosses and end of level bosses. Mini boss fights take place across dimensions. These dimension can be reached by moving over the top edge on the screen. Floating green portals and big red snake like creatures can also transport you to different dimensions. Aside from the standard weapon (button one), more powerful weapons (button two) can be obtained by collecting crystals in different color and shape, though these quickly deplete. The game can be played solo or with a friend in alternating turns.