I't a fun, little game! :) There does not always need to be a lot of depth to a game to be enjoyable! The actual game screen size could have been a bit bigger, but it also works fine as it is!
The "handmade" aesthetics are working really well for this - I am sure with a few more animations, background sprites, or just a variety of different meteor sprites, in the same look, it would look even more polished!