Ever play Super Stardust HD or Super Stardust Delta? Resogun is by those folks, a side-scrolling shmup (short for “shoot-em-up” — slang lesson!).
Don’t let “side-scroller” fool you: you’re actually arrowing left or right (and up or down) in a cylindrical fashion, the background rotating from foreground to background fluidly. Imagine someone taking Gradius and folding the level ends around until they touched (and chopping out a bunch of the middle) and you get this frenetic little side-shooter.
Housemarque / Sony Computer Entertainment