Its a flame thrower. click the mouse for a brief flame and hold the mouse down for constant flame. Use the sliders to interact with the flame (flame width 1 is for how much flame you want to go upwards from the flame thrower and its the same thing with the flame width 2 except its for how much fire you want to go downwards and the slider is in the negatives.)
All code by me. Inspiration : The Boring Company Flame Thrower