This feels more like a pitch than a parody.

The characters sound very Southpark for better or worse.

Vegeta though, is pure gold.

Took me a bit to figure out.
There's something magical about being able to just destroy everything.

It's very easy to get stuck on in the blocks when changing rooms, though that's minor since you can clear them by that point..

Looks fun.
Looks like one leg is way bigger than the other on each girl though ^^;
I'm guessing they're trying to be foreshortened, but the size way too extreme.

Edit (responding to comment);
I guess one thing you can do is flip the canvas. That usually makes uneven parts easier to spot. For this one, IMO, I would probably make the thighs more even, and lengthen the upper part of the legs that are lifted.

Another thing you could try is to really push and alter the lighting on the other leg. Both legs legs here have the same bright lighting so they appear to be on the same plain, it makes the size discrepancy way more noticeable (and kills whatever foreshortening effect that might be in play here).

Hopefully that helps :)

Rough and simplistic, but cute.

Looks kind of Binding of Isaac to me.