Move around with WASD and shoot with the rat--err mouse. Store doesn't work cause you don't get coins because YOU ARE A POOR POOR LITTLE MAN.
So today I found this deep in my unshared projects, guess I forgot about it lol. Chances of finishing are like 0 so I'll just share it. Credit to: Tom Van Den Boogaart BFXR @ErnieParke @Squig3 @SquidInk