Use "W" "A" "S" "D" to move, hold down ur mouse to attack, press "R" to reload (yes, there is reloading in the game), once your ammo goes down to 0, it reloads automatically, and, uhm, don't die. Also, upgrades are with "Q" "E" and "F" Q is damage upgrade, E is ammo upgrade and F heals 1 hp every time (there is no max hp) Press "Z" to change guns. (make sure to reload as soon as you swap cause, they wont have ammo whenever you switch and also, don't have shot gun until u have 1.5 damage on minigun cause, u don't do damage with it.)
For the 100 Followers Jam. Also, thanks to @joebobhenhenl4new for the laser cannon and the shotgun costume. (Definitely didn't steal)