A cute map pack! It was short and sweet, which is good, doesn't waste the player's time.
For the levels, I'll give some general advice, since they all seem to be suffering from the same issues.
-Artificial levels (factories, space ship etc.) don't have to be made up of only squares. You can get plenty of mileage out of other geometric shapes when designing in Zone Builder, like quarter circles, polygons and more. Also, don't be afraid to use slopes even if it's not grasslands.
-Encourage the player to go higher/lower. The first level actually does try it with springs, but every other level is essentially "jump from A to B".
-You can probably double the size of the first half of the maps, they're very tiny. 1.09's level sizes don't mesh well with current design expectations or player physics.
-Levels need something interesting to do. This is pretty open ended, you can do whatever you want. Just add anything besides jumping.
That being said, I hope you continue to polish this pack, or improve on your future levels in general!