this is a pretty easy thing to do, so to give thy character custom health thee worme will have to:
1. make it so after the run starts player gets abaddon
2. then after 0.01 seconds after the run starts (we'll use that a lot) the abaddoon is stolen and in the next rule on the same second gets a healing item
3. make it so in 0.02 seconds after the run starts player gets damaged for 10 halves of hearts (amount varies between different characters used as the base)
4.then on the same second take the healing item away and thats ith
also i think all the rules shalt go in the same order as in tutorial (doesnt matter if they art on differente page)