Devil Daggers is simple, fun and insane all at once
 

Call of Duty getting too complicated for you? I got a nice alternative, Devil Daggers.

Basically you run around on a flat surface with one hand extended in front of you. There is no ammo to pick up, pressing the mouse button shoots and infinite supply of dagger bullets. You are under constant assault with little time between waves. One hit, you're dead.

The first time you play you might last 10 seconds. If you're good, a minute. Then there's this guy who lasted 10 minutes.

https://www.youtube.com/watch?v=r_BWmn3Ds0E

The game is like $4.99 on Steam.