GD's Shooting Practice Not worth the time.
Alright, it's functional...to a point. You've got many, many errors within the way things lay out. Most of my problems with this game are aesthetic, but I'm not going to bag on your art.
However, you need some form of boundaries for the enemies. They appear everywhere. They go beyond the walls that you've set and will pop up in front of your character's arms and gun.
You've got quite a few typos and need to change your fonts.
The game is not riveting to say the least, but it's functional. Just keep at it.