Okay, I'll admit, it is pretty good. As a pure game experience, it probably does deserve the top spot. At first I was skeptical, as the whole thing seemed too manic to actually be manageable. But as I played, subtle hints stood out that convinced me of the title's quality.
1. The camera zoom. The camera zoom pulls out the more you move. (within a defined limit) And it zooms in on you if you don't move around much. Not terribly significant, but it does afford you the opportunity to view the art up-close.
2. The imp. Most of the enemies just seem to be randomly spawning in, running around fairly mindlessly, and throwing stuff at you. When you kill them, they drop a moving power-up that usually heals you. That doesn't strike me as very good design. But the imp changes all of that, and adds an interesting wrinkle. The imp isn't trying to attack you, he is attempting to collect any of the health bonuses that the other enemies drop. You need to be constantly grabbing health power-ups in order to survive in this game, and the imp is attempting to stop you. Killing the imp before he escapes causes all the health he had collected up to that point to spill out. This simple concept improves the gameplay immensely, giving you another element to watch out for, and different ways to approach it. You could kill the imp immediately, so that he can't snatch any of your health. Or you could wait for the imp to collect the health for you, and then kill him just in the nick of time.
3. The Floor drop. A quick down-tap will allow you to drop through the floor you are standing on. Not immediately obvious, but essential for a game with only one real level.
I had intentionally avoided using the likenesses of copyrighted characters in my own game, so I didn't take quite as much of a shine to the enemies as everyone else seems to have. The animations and graphics are clean and well-made. I would have preferred to see a little more "weight" to the characters' animations, but that is just an aesthetic quibble. One of the best features of the graphics is actually the GUI, and the non-game elements. They are laid out well, and have a very nice look to them. I was especially pleased by the custom logo on the main menu page.
The game reminds me of a high-energy version of the original Mario Bros. game. (single-screen, randomly spawning enemies, etc...) I approve.