shift = buildupgrade mode
shift + mouse = shoot
Work during a day, fight at night. That's the game K.U.L.I in a nutshell. Begin build walls, towers and fortifications as a protection from incoming zombies. Except you, also few other survivors exist. If you rescue them, they will help you with the protection. In every round you will have certain task - kill some number of zombies, build many towers, rescue X survivors. Controlling of the game is quite unusual - mouse for movement with the hero, and for all other heroe's skills there is a combination of mouse and Shift key. Many times you will get a feel, that your hero is jammed. In these cases check whether the hero is not just near some obstacle which you must help him to bypass. Have fun.