The setting:

A virus has taken over the tiny world inside your PC. You are the last line of defense. Eliminate 100% of the virus before time runs out!

Instructions:

You can select from 5 weapons to shoot. Each weapon (except the first one) costs 'bits' to shoot. Earn bits by killing enemies and shoot more powerful bullets!

Controls:

Movement: W,A,S,D / Arrow keys

Shoot bullets: Left click (LMB)

Cycle through weapons: Right click (RMB)

This game was developed for Gamedev.tv's annual game jam with the theme 'Tiny World' in 10 days.