It's ok
good but got boring and repetitive easily,you should make a campaign mode,and a quit button if you want to quit.Also,how about a suvival made where many enemy spawn at random times.(make the enemys weak like hitting them 5 times and they will die.)and you can fight diffrent types of guys and not the same one every time,do the same thing with your backgrounds.Well,HAVE A NICE DAY:)