Your game has potential, but it has problem that can be solved. First change the fire button from the mouse button to the space bar. Not every player would have a mouse. Second included a quit the game within the main menu or within the pause menu, which goes to the next suggestion is to add a pause menu. Next add a tutorial menu within the main menu that way the player would know what to do within the game. To restart the game after losing a life change it from the space bar to the enter key. Finally, I noticed that the game have a zoom in and out when pressing the “4” and “5” keys. Could you changed it to the “Z” key to zoom in and “X” to zoom out. I hope these suggestions would help your game.