well..
good job on the concept. i judge by the way you submit this, that it is a beta release? if not, i have some suggestions...
-add sound effects--like the shotgun making noises.
-add something along the lines of "percentage of hits/total shots" since you have unlimited ammo.
-add different levels that would increase your skill of shooting "da wabbits" (limited ammo, having to reload, etc. and more targets/different targets/change of scenery since it got boring after the first 30 seconds)
-maybe a pause button wouldn't harm anyone, now would it?
-the killzones weren't that great, but what IS perfect anyway? nothing.
-upgrades of guns as you progress.
with all that set aside, it's a good beta release.
bad spelling is a crime.