I am going to make an update after the jam :D.
It is a sandbox sort of game, and I was hesitant to add an actual goal, but I am going to add some features which should make the game more engaging.
Some features I am considering including in the update include: a laser on the shield drone that shoots enemy missiles, a statistics menu so you can challenge yourself to do anything, a delay after the enemy drone spawns so you have a chance to fight it, and much more! I am very excited!