My Third Game With 5 Levels

I think I am finally getting a hang of this game making stuff.  I worked on my game for several hours today, and I am pretty pleased with the results.  I accomplished to get 5 levels completed in record time.  It at least felt like it was quick, but when I look at my clock I realize how many hours really went by.  I guess time really does fly when you are having fun.

Are you wondering what I added?  Well, mostly different sized, and colored asteroids.  I added some spaceships which give extra lives if shot down.  I added some falling stars.  You can now see your final score at the end of the game.

I am a little stumped right now though.  My space is starting to get a little limited, and adding new objects to the game will start becoming more difficult.  I am also running out of ideas on what to add, and what to do to keep making each level get harder without making it impossible.