About Toy Tanks
but a lot of your first time players are going to leave because your window isn't a standard Windows window, so they'll be afraid it's malware of some sort.
From the screenshots alone, I think you need to desaturate the floor a little bit.
The controls take some getting used to so a single player mode would really help. You don't need AI (though it would be nice) you could just have targets randomly appear to give the player a way to practice moving and shooting. You could have challenge levels where you need to shoot all targets before time runs out.