Fun defense-style game! Your minimalistic art and style fit the jam perfectly. I do wish I had a bit more range to shoot at incoming objects. I died pretty quick almost every time. If that's by design, maybe add a simple game reset button or just reset the game/level for the player instantly upon death.
Unless I missed something, the only way I knew how to play again was to view the high score and quit the game, then come back and click play again. Overall, great job though!