It's a steam key.

QP Shooting - Dangerous!! is a bullet hell type shoot’em’up starring the pudding-loving dog girl QP seen in 100% Orange Juice. Nothing can stand between QP and her pudding - not even difficulty options to reduce the experienced gamer to tears!

A mysterious nemesis has taken pudding away from the world. Can a lone heroine with a sweet tooth stop their nefarious plans?
It's time to get back your pudding... again!

Completely unrelated video:
https://www.youtube.com/watch?v=MfzNJE4CK_s