@Neospector I am not good at programming things but it's good if you've found some way. I was thinking something like heat simulation on/off button except it's above the element menus (or anywhere else on the screen) and is a stickman immunity on/off button.
Pretty good idea, but a post above says "What if the enemy floods him with something supposed to kill? Stickman can become what it touches, so he'd become immune". Better implement a different "Iwantthisparticleasammo" system.