Really nice job with this. You know know your art isn't great, but as strange as it seems you manage to be a good animator despite being a mediocre artist. You got bad drawings that move well. The drawings aren't necessarily that bad, though. The thing that bothered me the most was how high the girl's boobs were.
There were a couple of places where the humor fell flat. When all that treasure randomly falls out the guy's ass right when he denies being a thief, it feels cheesy and cliche. And when the villain says the plot needs an antagonist, that nearly ruins the whole story. You gotta decide whether you're taking this story seriously or not. You can go with the Newgrounds tradition of wacky nonsense comedy, but that doesn't seem to be what this is. You seem to be trying to get your audience to be invested in this, and so your characters are going to need motivations.
I wanna say really good job with the sound effects. I know sound is always a bitch, and your sound design stood out to me as skillfully done.