Top down survival shooter
Shadowgrounds and Zombie Shooter may be the more current entrants in the top down shooter genre, but they definitely didn't invent the genre. True, Phobia was no pioneer either but it did push the genre just enough to merit being played, but Phobia 2 did push it quite a bit more. Sure, it is still a 2D top down deal, and by the time it was released gaming was fully immersed into 3D worlds. But, that's no issue, here, as the game manages to push more enemies towards you, it also manages to create a very satisfying and diverse host of scenarios and, as a plus, it brings hordes of aliens and mechanoid creatures towards you rather then zombies. The game is at its best when you're so thoroughly outnumbered that your only mission is blind and furious survival, which, almost unexpectedly is very compelling and energizing, pure arcade fun, which sure makes this game a keeper! So, if you're looking to find a low maintenance, low specs shooter, this can be it without issues. It's diverse, furious at times and well developed. Give it a try!