Just a day in a city, a bloody horrid one at that.
Man walks down street, man spots rock, rock turns out to be zerg larvae! Larvae spawns into hydralisk! ACK! Buddy gets pwned in a zergling rush! Keke! His scalps worn for a hat, poor nameless stickman guy. At least it wasn't like that poor kid from the Exorcist that took those damned hellmutts five minutes to kill off, most inept predators, ever. At least YOUR dude went in for a clean kill. Onward!
Graphics: Sadly, it's a stick cartoon, you gave it a background, so it's at least that much in your court.
Style: Buddy finds a rock, of horrors! And gets eaten by a stick hydralisk sporting Cookie Monster's eyes. Slammin'.
Sound: There was sound, yes. Not exceptional, but it was there.
Violence: Dude. The guy gets eaten off screen, blood, everywhere! GORE! Monster even leaves behind bloody footprints in it's wake.
Interactivity: It had a start button, that still counts for something.
Humour: "A rock!" -rock kerBLINKS!- "WTF?" Humour.
Overall: It's a stick movie with a plot twist of man gettin' eaten by a monster. What more is there to be said? It moved fluidically so it's still good enough.