your game is working nice, here is my feedback.
- good start menu, i like that players can come back with increased difficulty
- the art style is working ok, some background art would help sell it though
- good sound effects, for the players shoot sound you might want to use a shorter sound
- fun music, but it seems familiar, the loop is a bit short also
- i liked the final boss fight and the animation at the end of the game
- the music at the end of the game sounds familiar, was it ai generated?
- in story mode the difficulty should increase more and more to build up to the boss