Blast the Skulls

Skulls reminds us of death and sometimes, some people think of it as one of those voodoo magic that will haunt us.  Of course, we should know better than that because this is the moden times already and those things are just past.   However, in this game, skulls seems to be a problem because the hero wants to eliminate all of them by shooting at them.  The game is played via mouse and the idea here is to clear all the skulls in a level.  You have  a limited ammo, so you need to figure out how to get rid of those skulls without using much ammunition.