I really liked the music and smooth controls, but I found a few things you may want to fix to give players the best experience.
-When you go all the way to the right, you can't shoot up or down.
-Enemy shots look the same as yours.
-You can shoot diagonal if pressing two arrow keys, but you can't shoot down and right.
-A little repetitive, maybe you should add a boss?
Overall, it's a fun game to kill a few mins playing