Corodef

WASD or ZQSD to move the player.

Left mouse button to fire.

Esc to pause the game.

First level:

Win: enough patients could safely get out.

Loose: a certain number of patients have been infected (indicated by the red bar filling up at the top).

Best possible score is 225 and 0 infected.

Disclaimer:

Use at your own risk, especially the linux version which I could not test at all.