Press the flag. Use the Health slider to change what you game health will be. The RGB color will change in response to your heath!
Shoutout to @Wes64test for the RGB system! This is an edit of my Fading version this new one will instant update with the new color and wont show the inbetween. BTW: There is a glitch where yellow will show at 100, it will correct itself after. Update 11/4/17: Your Health may now surpass 100 and the function won't activate until under 100. In future i will add buttons for increase and decrease.