This is another nitpick, but some of the slider names seem a bit unclear. I didn't notice them at first, but our artist isn't familiar with the game maker system and had trouble with some of the names
For Gravity, I think the max slider is supposed to be direction
For Alpha, I think begin/middle/end is more clear than min/mid/max. Most of the other sliders use min/max to represent a range of starting values, so our artist initially assumed the same here rather than the values corresponding to different points along the particles lifespan