The controls are good, and for your first time, this is a great accomplishment. I believe you did the art yourself, too. Completing the art and coding the entire game in just 10 days is incredibly good for your first game jam!
Regarding the game itself: the intro could be shorter—I initially thought I needed to press a few buttons for something to happen. Also, a few more ways to kill the enemies might help keep the gameplay fresh. I truly think you should continue working on this project even after the jam, adding a few more elements to develop it into a fully functioning game.