The game is good. I quite like it but you could make a few minor changes to the core gameplay to make it appeal to a lot more people.
For example, the boundary for the stage/level: there were tiles extending beyond the stage which made me think I could go there but I couldn't. And also maybe add a few more sound effects.
One thing I really like about the shooting is it goes through the enemies and damages any enemy in its path. That is really nice.
Overall it's good for something made in a week. I liked it. Keep it up!!