Agreeing with djhannesx
This project is well rounded. The gameplay is quick to grasp and fun at first. The music and sounds fit the graphics, and it's presented nicely. However, there isn't enough variety to really motivate me to stick around and go further. Different enemies or different power ups would be welcome, just something to break up the "routine" the game quickly settles in to.
You said it took about a week to make, and again it's a nice project as it stands. But, with some more time, this could turn in to something great. I'll be watching for when that happens. Until then, thank you for sharing this project with us, and keep on rockin'!