Whoa that was a tricky one lol! I couldn't clock it by getting past level 4 unfortunately. After quite a few attempts i could only get to within view of the gun and then either the big guy or little zapper guys got me. You definately succeeded on the hard difficulty. The controls to grab the gun/key etc. are a bit clunky or hard to pull off quickly maybe this was your idea for difficulty i did better once i discovered the run button but still not much time before the big dude would get you.
Other things to add maybe a few more sound effects and some music would of been a nice touch for the game :)