1: The proportions of it. I can practically see a mouse cursor clicking on the door of the house, saying "open door".
2: The figure in panels 1 and 2. That's almost the EXACT pose that characters in the game were in when facing down.
3: The "Holy crap, it isn't a mop, but a living thing!" ...I just did realize this one. There's a scene in Zak where a woman finds a "broom" sleeping in a bed, then realizes it's actually an alien.
This is NOT a bad thing, though. If that's actually your drawing style, let me be the first to say it rocks completely. Zak was my first REAL game addiction, so it holds a lot of good memories.
Edit: You know, I think even the line "*sigh* What a mess!" was in the game somewhere. But maybe not exactly.
Probably just a freaky coincidence. I'd recommend to look around for screens of it(if not the game itself). It's in the same line of games as Maniac Mansion and Monkey Island. That probably tells you something about the content of it. 
