For a first level, it's pretty good. In fact, it deserves a song quote!
Well I just want to see the light,
And I don?t want to lose my sight,
Well I just want to see the light,
And I need to know what?s worth the fight,
Anyway, a couple of things that could use improvement. First, there's a lot of flat running. Add small bumps and stuff on the ground. Second are SGEs, or Small Graphical Errors. These are usually just problems with the tileset. For example, look at x1002, y999 (the screen with the giant purple charging ant things). There should be a border around all of the ground tiles. The third thing isn't much of a problem, but it could use a lot more decorations. Other than that, it's really good!