The gameplay was good, while a bit laggy. But that's Adobe's fault, not yours.
However, I have to mention the biggest gripe, which is in the UI.
I thought that I was choosing a character, not a game mode. You know, like play as a robot, or play as a human. But apparently human means "Campaign", and robot means "Level Editor". And there are NO labels to indicate this, not even if I hover over the human or robot; I'm just supposed to magically know what it means.
It's pretty and all, but that's mystery meat navigation right there. A UI flaw that should always be avoided, where the developer designs something that is cryptic and/or uses vague images in an artistic way, but the UI suffers, and some to most users won't figure out wtf is going on.
Graphics, programming, sound, and controls were top notch, though.
4/5, -1 star for the Mystery Meat Navigation