Well Done!
If you keep cranking out solid games like this, try to get paid for it, I believe you have some talent! Level 5 went by in less than 10 seconds, not sure if that's a bug or not, and the starry background has an ugly seam, look for graphic utilities that work with tiled graphics for some help with that. I used to drive myself crazy trying to make space tiles that seam well ;) always a line of stars or a line of the lack of stars that our brains pattern-detect too easily.