A mighty icon in pixel form! :D Snake not related to the level up procedure? How about the frog? Snail? Fish in your lap? Maybe those obstacles that need to be overcome to reach the next level, that keep seeping into the background, distractions, excess tasks, such stuff...
Really cool you actually made programs to make parts of the image, don't think I've ever heard of such things being done in the name of art before! Though the Mobius in the examples seem a lot more uneven than the one in the picture? Tweaked further before export, or modified in drawing after that...?
Love the texture, text and cubes in particular - all the orange stuff really stands out, and the centerpiece in its impeccable mobius frame... though think it would've been all the more pompous in gold? Also seeing as it seems like it's supposed to stand behind all other layers, it's a bit strange the floor actually goes in behind it, think it would've been perfect either as a gateway in the wall or as something floating in front of all... if so maybe with some form of pixel disturbance/effect to show the hovering.
Other than that: looks amazing! Great attention to detail, and fun to see the revisions it went through before its final form too. Happy Pixel Day!
-cd-