Recently, I've been trying to recall the name of an older game. It was a 2d shooter 10+ years old for pc. Made by an indie company. It was rated M and gameplay involved you spawning on a map and killing hordes and hordes of zombies and aliens. As you leveled up on each map you would gain perks mid match to alter and improve yourself. Weapons would also drop as well as powerups. There were about 60 levels and the game even had a typing mode where you could kill monsters by typing words fast enough.