Hey this is a great idea! I really like the idea of this game, it gives a bit of personality to a space invaders type game. I see lots of room to make the game even better if you choose to do so! Its a lot of fun as is though! One thing I think would be nice is if the incoming asteroids were line up on the same x axis as your platform. that way one would only destroy one piece of of your platform. I felt a lot of times it was very difficult or maybe impossible to keep my platform safe as at times there be three different asteroids coming at the same time for a single platform!
I enjoyed this submission! Great work!