Really cool game you made ^^ The first time an enemy showed up and pulled out a shotgun out of nowhere I almost jumped on the chair lol
The only advice I could give you is to make it more challenging! Maybe limit the ammo that the player has, or tune down the fire rate, so it's not that easy to win against the robbers ^^
Good job :D (also, I felt kinda cheated when I tried to play the browser version but it didn't work.. but hey, it is what it is heheh)