Game jams are always difficult with time, I hope you get time to work on it some more. A few more hitboxes and sprites and I think you're there. It's great that you managed to work in a menu system, mini-tutorial, and the story pages. In terms of the game if you get more time to work on it, my tip would be to add a slightly random amount to the angle when the enemies shoot at you - that will make them seem more accurate when the player is closer and less accurate when the player is far away. Then you could position the enemies so the challenge is for the player to find somewhere good to shoot from.