Stellar Bastion

Wave survival where the aiming is done for you, so the entire game is where you stand. Your rifle fires at the nearest bug on its own and never runs out; the dropped machine guns, shotguns and rocket launchers do, which makes each one a decision about when to spend it. Waves step up every thirteen seconds and every fifth one brings a Hive King that speeds the whole swarm. Stellar Bastion is a positioning puzzle disguised as a shooter, and it gets very loud.