I might actually make this into a game when I have time.  

I would like to play that game :)

 honorificablfhjft...what?!! :)

- Needs some AA , you've got a lot of palette left to use ( may as well AA) -

 nice :)

 haha very nice concept I love it

Level 1: honorificabilitudinitatibus - screw level 2.

Nice pixels and use of a limited colour pallet. The clouds could be a little less jaggy, with some more focus on getting the curves smooth and not so many random chuncks that stick out in an unappealing way. Personally I think the clouds would be stronger if they had a similar style to the rest with strraight lines and standard sooth curves.

Another point to do with the clouds, how far would the ships drop before it's gameover. I ask this, because it looks as though the enemy ships and words may get lost oce the ships reach the clouds.

 quite nice, but the lack of AA on the clouds ruins the vector-like look of everything else in the mockup.