For those of you thinking it's the game's fault for the "gun not shooting." It's most likely the accuracy factor. If you don't take time with your shots, your gun will get increasingly more inaccurate. Rate this up so the game doesn't get a bad rating for a misunderstanding.
I'm pretty sure the "TDS" means Top-Down shooter. (read that from the description) And running upgrades don't work, or they are almost useless and should be changed. I can't recognize a difference in my speed when I buy an upgrade for it.
Huge potential, but there needs to be more incentive to keep playing. Some medals, upgrades, different enemies, new game modes, different background, and anything else.