I really wanted to like this. The concept of killing different sites and services associated with Flash is funny and different, but there are so many things in the way of this feeling like a fully fleshed out experience.
In terms of the story, the typos, font, and low contrast background (just increase the alpha a bit) make it hard to read the intro.
Regarding gameplay, the hitboxes for the actual fighting feel really imprecise. It's hard to tell if there are separate hitboxes for the player character and their weapon, as it kept feeling like I was taking damage while attacking. The characters are also big relative to their movement speed, making them feel slow and making dodging feel really hard. It felt less like I was managing attacks and more like I was managing how many frames two big, clumsy hitboxes were intersecting with each other. Having snappier controls is really the biggest thing you could do to make this feel better. As someone whose old (2008-ish) games felt like this, I know all too well how these kinds of controls can feel natural to you as the developer but frustrating for the player.
The eyes and mouths on the graphics are cute and decently well-drawn, most of the other graphics look a little sloppy but that's okay.