heyoo
For effects size, you have to find one that's of the size that you want. Because the size option doesn't work xP I think the flames in El Dicastes are big, and the ones from Endless Tower are medium sized :3 just copy them and change them for the ones with the color that you want :3
uhm, for loop.. you have to press enter after you add a number. It's only needed in the effects menu , just like Syouji explains in his guide :3 some effects have different loop numbers than others, I usually just check their options in the official maps and imitate them.
Mina-chan's post in How to increase effect size was marked as the answer